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Gearbox Oil Cooler

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Gearbox Oil Cooler and Pipe Kit PDK 

Restore efficient transmission cooling with this OE Match gearbox oil cooler and pipe kit for Porsche Boxster and Cayman models equipped with the PDK dual-clutch transmission.

Fits:

  • Porsche Boxster 987 MKII 2.9L 2009-12
  • Porsche Boxster S 987 MKII 3.4L 2009-12
  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)

Diagram Ref No 20, 21, 22, 23, 24, 25 and 26

The gearbox oil cooler helps regulate transmission temperature, while the supply and return pipes circulate oil through the cooling system.

Supplied with associated seals and fittings, this kit provides a convenient solution for replacing leaking, corroded or damaged PDK cooling components.

Kit Contents

  • 1 x Gearbox oil cooler
  • 1 x Oil feed pipe
  • 1 x Oil return pipe
  • 1 x Retaining plate
  • 4 x Pipe sealing O-rings
  • 2 x Pipe retaining plate

What Does It Do?

The gearbox oil cooler removes excess heat from the transmission oil, helping maintain suitable operating temperatures.

The feed and return pipes circulate oil between the gearbox and cooler, while the O-rings seal the pipe connections to prevent leaks.

Why Is It Important?

Correct gearbox oil temperature is essential for reliable PDK operation and long-term transmission protection.

A damaged cooling system may cause:

  • Transmission oil leaks
  • Excessive gearbox temperatures
  • Reduced cooling efficiency
  • Low transmission oil levels
  • Increased wear to internal gearbox components

Why Do PDK Oil Coolers and Pipes Fail?

Common causes include:

  • Corrosion of metal cooling pipes
  • Age-related deterioration
  • Damaged or hardened
  • O-ring seals
  • Repeated heating and cooling cycles
  • Road debris or impact damage
  • Leaking or damaged pipe connections

When Should It Be Replaced?

Replacement is recommended when the oil cooler or pipework develops leaks, becomes corroded or shows signs of damage.

The system should also be inspected when investigating gearbox overheating, transmission oil loss or damaged cooling connections.

Why Choose OE Match?

OE Match provides aftermarket replacement components for Porsche transmission repairs.

This kit combines the gearbox oil cooler, feed and return pipes, retaining plate and sealing O-rings, making it a practical solution for renewing multiple cooling system components together.

Key Features

  • OE Match aftermarket PDK oil cooling kit
  • For selected Porsche 987.2, 981 and 718 models
  • Includes gearbox oil cooler and connecting pipes
  • Supplied with retaining plate and four sealing O-rings
  • Helps maintain correct transmission oil temperature
  • Suitable for repairing leaking or damaged cooling systems
  • Alternative to purchasing components individually

Installation Notes

Inspect all gearbox cooling connections and mounting points before installation.

Fit the new O-rings carefully, ensuring the pipes are correctly seated and secured with the retaining plate.

Use the correct Porsche-approved transmission oil specification and follow the manufacturer's filling, level-checking and installation procedures.

Professional installation by a Porsche PDK transmission specialist is recommended.

OE Match Porsche Boxster & Cayman PDK Gearbox Oil Cooler and Pipe Kits

Porsche 987.2, 981 and 718 Boxster and Cayman models equipped with PDK transmissions use a dedicated gearbox oil cooling system to regulate operating temperatures.

The OE Match gearbox oil cooler and pipe kit provides a convenient replacement solution for damaged or leaking transmission cooling components. Combining the oil cooler, supply and return pipes, retaining plate and sealing O-rings helps restore reliable oil circulation and gearbox cooling.

Design911 supplies OE Match Porsche PDK oil coolers, transmission cooling pipes, gearbox seals, retaining brackets and associated transmission repair components.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9G230701700
9G230701700

The product you are viewing cross references to these numbers
9G230701900/1KIT
Product Information
Product Information

Heat Exchanger & Gasket for PDK Gearbox

The OE Match PDK Gearbox Heat Exchanger and gasket is a replacement transmission cooling component for selected Porsche Boxster, Cayman and 918 Spyder models.

Fits:

  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
  • Porsche 918 Spyder 4.6L 2014-15

Diagram ref no 1

Designed as an alternative to the Genuine Porsche part, it helps regulate gearbox oil temperature, protecting internal transmission components against excessive heat.

What Does It Do?

The heat exchanger transfers heat away from the PDK transmission oil, helping keep the gearbox within its intended operating temperature range.

By controlling oil temperature, it supports consistent hydraulic operation, clutch engagement and gear changes.

Why Is It Important?

PDK transmissions generate heat during driving, particularly under heavy loads or sustained performance use.

A faulty heat exchanger can contribute to:

  • Excessive gearbox oil temperatures
  • Reduced transmission cooling efficiency
  • Irregular gear changes
  • Transmission warning messages
  • Premature wear of internal components

Why Does It Fail?

Common causes include:

  • Internal corrosion or deterioration
  • Blocked oil or coolant passages
  • Damaged seals or connections
  • External impact damage
  • Internal leakage between fluid circuits

When Should It Be Replaced?

Replace the heat exchanger if it develops leaks, becomes blocked or can no longer regulate transmission oil temperature effectively.

It should also be inspected if gearbox overheating or unexplained fluid contamination is detected.

Checks & Installation

Inspect the oil and coolant connections, seals and surrounding pipework before installation.

Use the correct Porsche-approved transmission fluid and coolant. Follow the specified filling and bleeding procedures.

Professional installation by a Porsche transmission specialist is recommended.

Key Features

  • OE Match replacement PDK heat exchanger
  • Alternative to the Genuine Porsche component
  • Helps regulate transmission oil temperature
  • Supports reliable PDK gearbox operation
  • Replacement for leaking, blocked or damaged units

Porsche Boxster, Cayman & 918 PDK Gearbox Heat Exchangers

Effective transmission cooling is essential for maintaining consistent performance and protecting the internal components of Porsche PDK gearboxes.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9G230701900
9G230701900
9G230724100

The product you are viewing cross references to these numbers
Special Order item
99630702001
Product Information
Product Information
Gearbox oil cooler AFT basic plate. 18.64 x 3.53

Fits:
Porsche 996 (911) Carrera 2 (1998 - 2001)
Porsche 996 (911) Carrera 4 (1999 - 2001)
Porsche 996 (911) Turbo (2001 - 2001)
Porsche 996 (911) GT3 (1999 - 2001)
Porsche 996 (911) GT2 (2001 - 2001)
Additional information: Only in combination with Tiptronic.

Click 'Zoom in' for large parts diagram.
Diagram ref no 1.

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Related, superseded, cross reference or alternative numbers for comparison.

99630702001
99630701701
99630701700
99630702001

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Special Order item
99630701701
Product Information
Product Information
Gearbox oil cooler AFT.

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-07 Tiptronic
Porsche 987C Cayman 2007-08 Tiptronic
Porsche 996 C2 / C4 >>2001 Tiptronic

Click 'Zoom in' for large parts diagram.
Diagram ref no 1.

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Related, superseded, cross reference or alternative numbers for comparison.

99630701701
99630701701
99630701700

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99630701701/2
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Product Information
Gearbox oil cooler ATF.
Larger than standard. 15% larger than the original for better cooling.

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-07 Tiptronic
Porsche 987C Cayman 2007-08 Tiptronic
Porsche 996 C2 / C4 >>2001 Tiptronic

Diagram ref no 1.

The installation of a larger gearbox oil cooler for the Porsche 996, specifically for the Automatic Transmission Fluid (ATF), offers several significant benefits:

Enhanced Cooling Efficiency: A larger oil cooler increases the cooling capacity, allowing the ATF to dissipate heat more effectively. As a result, the transmission can operate at lower temperatures, preventing overheating and reducing the risk of fluid breakdown and premature wear on transmission components.

Extended Transmission Life: Lower operating temperatures due to improved cooling help prolong the lifespan of the transmission. Cooler ATF ensures that the internal components experience less stress and thermal degradation, contributing to a longer-lasting and more reliable gearbox.

Improved Performance: Optimal transmission temperature is essential for consistent and smooth gear shifts. With a larger oil cooler, the ATF maintains its viscosity and performance characteristics, promoting seamless gear changes and overall improved transmission performance.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99630701701
99630701701
99630701700

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99630701701/1
Product Information
Product Information
Gearbox oil cooler ATF
OE Match gearbox oil cooler for selected Porsche 986 Boxster, 987 Boxster, 987C Cayman and 996 models fitted with Tiptronic transmission. This replacement ATF cooler helps regulate automatic transmission fluid temperature, supporting consistent gearbox performance and protecting the transmission from excessive heat.

Fits:
cars with Tiptronic transmission

Porsche 986 Boxster 1997 - 2004 
Porsche 987 Boxster 2005 - 2007 
Porsche 987C Cayman 2007 - 2008 
Porsche 996 C2 / C4 >>2001 

Diagram ref no 1.

The gearbox oil cooler, also known as an ATF cooler or transmission oil heat exchanger, forms part of the Tiptronic transmission cooling system. It transfers heat away from the automatic transmission fluid to help maintain the correct operating temperature during normal driving.

What this part does 
  • Cools the Tiptronic automatic transmission fluid
  • Helps maintain stable gearbox oil temperatures
  • Supports smooth and consistent transmission operation
  • Helps protect internal transmission components from excessive heat
  • Supports correct ATF operating conditions
  • Replaces leaking, blocked or inefficient gearbox oil coolers 
  • Suitable for Tiptronic transmission servicing and repair
  • OE Match replacement for the original Porsche-style component.

Why Replace This Part?
The gearbox oil cooler can deteriorate due to age, corrosion, internal contamination or repeated heating and cooling cycles. Reduced cooling efficiency may allow transmission fluid temperatures to rise, while physical damage can result in fluid or coolant leakage depending on the system design. Replacing a faulty cooler helps restore effective transmission temperature control.

When to Replace This Part
  • Gearbox oil temperatures are higher than normal
  • ATF cooler is leaking
  • Cooler is blocked or internally contaminated
  • Transmission cooling system is being overhauled
  • Existing heat exchanger is corroded or damaged
  • Tiptronic transmission repair is being carried out.

Where it fits on the car
Fits within the Tiptronic automatic transmission oil cooling system.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99630701701
99630701701
99630701700

The product you are viewing cross references to these numbers
Special Order item
9G230701700
Product Information
Product Information

PDK Gearbox Oil Cooler 

The PDK Gearbox Oil Cooler is a replacement heat exchanger designed to regulate transmission oil temperature in Porsche Boxster and Cayman models fitted with the PDK dual-clutch gearbox.

Fits:

  • Porsche Boxster 987 MKII 2.9L 2009-12
  • Porsche Boxster S 987 MKII 3.4L 2009-12
  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)

Diagram Ref No 25

It transfers excess heat from the gearbox oil to the vehicle's cooling system, helping maintain consistent transmission performance and protect internal components against overheating.

What Does It Do?

The gearbox oil cooler helps remove heat generated during PDK operation.

By transferring heat from the transmission oil to the engine cooling circuit, it helps maintain the correct operating temperature for reliable gearbox lubrication and performance.

Why Is It Important?

The Porsche PDK gearbox relies on controlled oil temperatures for efficient operation.

Excessive transmission heat can contribute to:

  • Reduced gearbox performance
  • Deterioration of transmission oil
  • Increased internal component wear
  • Gearbox overheating warnings
  • Premature transmission damage

A correctly functioning oil cooler helps maintain stable operating temperatures.

Why Does It Fail?

Common causes of gearbox oil cooler failure include:

  • Internal corrosion or deterioration
  • Blocked coolant or oil passages
  • Age-related damage
  • Leaking seals or connections
  • Internal heat exchanger failure

These problems can reduce cooling efficiency or allow fluid leakage.

When Should It Be Replaced?

Replace the gearbox oil cooler if:

  • The heat exchanger is leaking
  • Transmission temperatures are consistently excessive
  • Cooling performance has deteriorated
  • Internal oil and coolant contamination is confirmed
  • The cooler is damaged during gearbox repairs

Always diagnose the cooling system and transmission before replacing the cooler.

Checks & Installation

Inspect the connecting oil pipes, coolant hoses and sealing rings before installation.

Replace damaged seals and follow Porsche workshop procedures when refilling and bleeding the cooling system.

Check the correct PDK oil level and inspect for leaks after installation.

Key Features

  • Designed for selected Porsche 987.2, 981 and 718 models
  • Helps regulate transmission oil temperature
  • Transfers excess heat to the cooling system
  • Supports reliable PDK gearbox operation
  • Helps protect transmission components from overheating
  • Replacement for leaking or damaged oil coolers
  • Suitable for gearbox cooling system repairs

Porsche Boxster & Cayman PDK Gearbox Oil Coolers

Maintaining the correct gearbox oil temperature is essential for reliable Porsche PDK transmission operation.

The 9G230701700 gearbox oil cooler helps regulate transmission temperature in selected Porsche 987.2, 981 and 718 Boxster and Cayman models, protecting internal components against excessive heat.

Replacing a damaged or leaking heat exchanger helps restore the original gearbox cooling system and maintain consistent transmission performance.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9G230701700
9G230701700

The product you are viewing cross references to these numbers
9G230701700/1
Product Information
Product Information

PDK Gearbox Oil Cooler 

The OE Match PDK Gearbox Oil Cooler is a replacement heat exchanger designed to regulate transmission oil temperature in Porsche Boxster and Cayman models fitted with the PDK dual-clutch gearbox.

Fits:

  • Porsche Boxster 987 MKII 2.9L 2009-12
  • Porsche Boxster S 987 MKII 3.4L 2009-12
  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)

Diagram Ref No 25

It transfers excess heat from the gearbox oil to the vehicle's cooling system, helping maintain consistent transmission performance and protect internal components against overheating.

What Does It Do?

The gearbox oil cooler helps remove heat generated during PDK operation.

By transferring heat from the transmission oil to the engine cooling circuit, it helps maintain the correct operating temperature for reliable gearbox lubrication and performance.

Why Is It Important?

The Porsche PDK gearbox relies on controlled oil temperatures for efficient operation.

Excessive transmission heat can contribute to:

  • Reduced gearbox performance
  • Deterioration of transmission oil
  • Increased internal component wear
  • Gearbox overheating warnings
  • Premature transmission damage

A correctly functioning oil cooler helps maintain stable operating temperatures.

Why Does It Fail?

Common causes of gearbox oil cooler failure include:

  • Internal corrosion or deterioration
  • Blocked coolant or oil passages
  • Age-related damage
  • Leaking seals or connections
  • Internal heat exchanger failure

These problems can reduce cooling efficiency or allow fluid leakage.

When Should It Be Replaced?

Replace the gearbox oil cooler if:

  • The heat exchanger is leaking
  • Transmission temperatures are consistently excessive
  • Cooling performance has deteriorated
  • Internal oil and coolant contamination is confirmed
  • The cooler is damaged during gearbox repairs

Always diagnose the cooling system and transmission before replacing the cooler.

Checks & Installation

Inspect the connecting oil pipes, coolant hoses and sealing rings before installation.

Replace damaged seals and follow Porsche workshop procedures when refilling and bleeding the cooling system.

Check the correct PDK oil level and inspect for leaks after installation.

Key Features

  • OE Match PDK gearbox oil cooler
  • Porsche reference 9G230701700
  • Designed for selected Porsche 987.2, 981 and 718 models
  • Helps regulate transmission oil temperature
  • Transfers excess heat to the cooling system
  • Supports reliable PDK gearbox operation
  • Helps protect transmission components from overheating
  • Replacement for leaking or damaged oil coolers
  • Suitable for gearbox cooling system repairs

Porsche Boxster & Cayman PDK Gearbox Oil Coolers

Maintaining the correct gearbox oil temperature is essential for reliable Porsche PDK transmission operation.

The OE Match gearbox oil cooler helps regulate transmission temperature in selected Porsche 987.2, 981 and 718 Boxster and Cayman models, protecting internal components against excessive heat.

Replacing a damaged or leaking heat exchanger helps restore the original gearbox cooling system and maintain consistent transmission performance.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9G230701700
9G230701700

The product you are viewing cross references to these numbers
9G230701900/1
Product Information
Product Information

Heat Exchanger for PDK Gearbox

The OE Match PDK Gearbox Heat Exchanger is a replacement transmission cooling component for selected Porsche Boxster, Cayman and 918 Spyder models.

Fits:

  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
  • Porsche 918 Spyder 4.6L 2014-15

Diagram ref no 1

Designed as an alternative to the Genuine Porsche part, it helps regulate gearbox oil temperature, protecting internal transmission components against excessive heat.

What Does It Do?

The heat exchanger transfers heat away from the PDK transmission oil, helping keep the gearbox within its intended operating temperature range.

By controlling oil temperature, it supports consistent hydraulic operation, clutch engagement and gear changes.

Why Is It Important?

PDK transmissions generate heat during driving, particularly under heavy loads or sustained performance use.

A faulty heat exchanger can contribute to:

  • Excessive gearbox oil temperatures
  • Reduced transmission cooling efficiency
  • Irregular gear changes
  • Transmission warning messages
  • Premature wear of internal components

Why Does It Fail?

Common causes include:

  • Internal corrosion or deterioration
  • Blocked oil or coolant passages
  • Damaged seals or connections
  • External impact damage
  • Internal leakage between fluid circuits

When Should It Be Replaced?

Replace the heat exchanger if it develops leaks, becomes blocked or can no longer regulate transmission oil temperature effectively.

It should also be inspected if gearbox overheating or unexplained fluid contamination is detected.

Checks & Installation

Inspect the oil and coolant connections, seals and surrounding pipework before installation.

Use the correct Porsche-approved transmission fluid and coolant. Follow the specified filling and bleeding procedures.

Professional installation by a Porsche transmission specialist is recommended.

Key Features

  • OE Match replacement PDK heat exchanger
  • Alternative to the Genuine Porsche component
  • Helps regulate transmission oil temperature
  • Supports reliable PDK gearbox operation
  • Replacement for leaking, blocked or damaged units

Porsche Boxster, Cayman & 918 PDK Gearbox Heat Exchangers

Effective transmission cooling is essential for maintaining consistent performance and protecting the internal components of Porsche PDK gearboxes.



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9G230701900
9G230701900

The product you are viewing cross references to these numbers
Special Order item
9G230701900
Product Information
Product Information
Engine oil heat ex changer for PDK transmission.

Fits:
For cars with PDK transmission
Porsche 981 Boxster 2012-16
Porsche 982 (718) Boxster 2017>>
Porsche 918 Boxster Spyder 2014-15
Porsche 981C Cayman 2013-16
Porsche 982C (718) Cayman 2017>>

Click 'Zoom in' for large parts diagram.
Diagram ref no 1

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9G230701900
9G230701900

The product you are viewing cross references to these numbers
Special Order item
98630702000
Product Information
Product Information
Mounting plate for Tiptronic gearbox heat exchanger.

Fits:
Porsche 986 Boxster 1997-04 Tiptronic (A8600 / A8605 / A8620)
Porsche 987.1 Boxster 2005-08 Tiptronic
Porsche 987C.1 Cayman 2006-08 Tiptronic (A8702 / A8721)

Click 'Zoom in' for large parts diagram.
Diagram ref no 5

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Related, superseded, cross reference or alternative numbers for comparison.

98630702000
98630702000

The product you are viewing cross references to these numbers
Special Order item
99970738840
Product Information
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O-ring for gearbox oil cooler ATF
This Porsche Genuine OE O-Ring for Gearbox Oil Cooler ATF is a precision-engineered sealing ring used within the automatic (Tiptronic) transmission cooling system. This small but critical component provides a fluid-tight seal between the gearbox oil cooler and connecting pipework.
Sold individually

Fits:
Porsche 986 Boxster 1997 - 2004 Tiptronic
Porsche 987.1 Boxster 2005 - 2007 Tiptronic
Porsche 987C.1 Cayman 2007 - 2008 Tiptronic
Porsche 996 C2 / C4  / Turbo 1998 - 2005 Tiptronic
Porsche 997.1 C2 / C4  2005 - 2008 Tiptronic

Diagram ref no 2

Manufactured to Porsche OE standards, it ensures correct dimensions, material quality, and resistance to ATF (automatic transmission fluid), heat, and pressure.

This O-ring seals the junction between the gearbox oil cooler (heat exchanger) and its associated pipes, preventing ATF leaks and maintaining correct system pressure. By ensuring a secure seal, it allows the transmission fluid to circulate properly through the cooler, helping regulate temperature and maintain optimal gearbox performance.

Functions & Technical Role
•  Fluid sealing: Prevents ATF leaks at oil cooler connections
•  Pressure retention: Maintains correct hydraulic pressure within the system
•  Thermal resistance: Designed to withstand high transmission temperatures
•  System protection: Prevents contamination and air ingress
•  OEM precision fit: Exact size and material specification for Porsche applications

Fitment / Position on car
•  Fitting position: Transmission cooling system
•  Location: Between gearbox oil cooler (ATF heat exchanger) and fluid pipes
•  System: Automatic transmission (Tiptronic) lubrication and cooling

Although small, O-rings are critical wear items exposed to heat cycles, pressure, and fluid degradation. Over time they can harden, shrink, or crack, leading to:
•  ATF leaks around the gearbox oil cooler
•  Loss of transmission fluid and pressure
•  Overheating of the gearbox
•  Potential transmission damage

Replacing with a genuine Porsche OE O-ring ensures proper sealing, reliability, and long-term protection of the transmission system.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99970738840
99970738840

The product you are viewing cross references to these numbers
99970738840/1
Product Information
Product Information
O-ring for gearbox oil cooler ATF, 18.64 x 3.53 mm
An OE Match O-ring seal designed for the automatic transmission (Tiptronic) oil cooler system, ensuring a tight, leak-free connection between the gearbox oil cooler and fluid lines.
Sold individually

Fits:
Porsche 986 Boxster 1997 - 2004 Tiptronic
Porsche 987.1 Boxster 2005 - 2007 Tiptronic
Porsche 987C.1 Cayman 2007 - 2008 Tiptronic
Porsche 996 C2 / C4  / Turbo 1998 - 2005 Tiptronic
Porsche 997.1 C2 / C4  2005 - 2008 Tiptronic

Diagram ref no 2

This OE Match O-Ring for Gearbox Oil Cooler ATF is a precision-engineered sealing component designed to meet original Porsche specifications for fit, durability, and performance. This O-ring is used within the automatic transmission oil cooler system, where it forms a critical seal between the cooler and associated fluid lines.

Despite its small size, this O-ring plays a vital role in maintaining the integrity of the transmission cooling circuit. It prevents leaks of automatic transmission fluid (ATF), ensuring proper lubrication and temperature regulation of the gearbox. Without an effective seal, fluid loss can occur, potentially leading to overheating, reduced lubrication, and long-term transmission damage.

Manufactured from high-quality heat- and fluid-resistant rubber, the O-ring is designed to withstand the demanding conditions of the transmission system, including exposure to high temperatures, pressure, and aggressive fluids. It is a direct replacement for original parts and ensures reliable sealing performance in both maintenance and repair applications.

This component is commonly used on Tiptronic-equipped Porsche models, making it an essential part during transmission servicing or oil cooler replacement.

Function
• Provides a tight seal for gearbox oil cooler connections
•   Prevents ATF leaks and pressure loss
•   Maintains proper transmission cooling efficiency
•   Protects against fluid contamination and air ingress
•   Ensures reliable long-term sealing under heat and pressure

O-rings degrade over time due to heat, pressure, and exposure to transmission fluid. A worn or hardened seal can lead to ATF leaks, which may result in overheating, poor shifting performance, or serious transmission damage.

Replacing this O-ring during servicing ensures a proper seal and helps maintain the reliability and longevity of the transmission system.

When to replace
•  During gearbox or oil cooler servicing
•  Visible ATF leaks around cooler or lines
•  O-ring appears cracked, flattened, or hardened
•  Preventative replacement during transmission maintenance
•  When removing or reinstalling cooler lines

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99970738840
99970738840

The product you are viewing cross references to these numbers
9P1301185A/1
Product Information
Product Information

O-Ring  for PDK Gearbox Oil Cooler Pipe - 12.25 x 2.5mm 
Sold each – 4 required per car

Prevent transmission oil leaks with this OE Match replacement O-ring, designed to seal the gearbox oil cooler pipe connections on Porsche Boxster and Cayman models equipped with PDK transmission.

Fits:

  • Porsche Boxster 987 MKII 2.9L 2009-12
  • Porsche Boxster S 987 MKII 3.4L 2009-12
  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman GT4 3.8L 2015-16
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
  • Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L

Diagram ref no 30

This precision-sized sealing ring fits between the oil cooler pipe and its connection point, creating an oil-tight joint that prevents fluid escaping under normal operating conditions.

An essential replacement when servicing gearbox cooling pipes, particularly where original seals have become flattened, hardened or damaged.

What Does It Do?

The O-ring forms a pressure-resistant seal between the gearbox oil cooler pipe and its mating connection.

As transmission oil circulates through the PDK cooling system, the O-ring prevents oil escaping around the pipe fitting.

When installed correctly, the seal compresses between the mating surfaces to maintain a secure, leak-free connection.

Why Is It Important?

The PDK transmission depends on maintaining the correct oil level for lubrication, hydraulic operation and temperature management.

A worn or damaged O-ring may cause:

  • Transmission oil seepage around cooler pipe connections
  • Oil stains on the gearbox casing
  • Gradual loss of gearbox oil
  • Reduced sealing effectiveness at the pipe joint
  • Potential transmission damage if oil loss is ignored

Replacing deteriorated seals helps maintain the integrity of the gearbox cooling circuit.

Why Do PDK Oil Cooler O-Rings Fail?

Continuous exposure to transmission oil, operating temperatures and pressure changes can gradually affect the condition of the sealing material.

Common causes include:

  • Hardening or flattening with age
  • Compression set from prolonged installation
  • Damage during oil pipe removal
  • Incorrect fitting or pinched seals
  • Deterioration caused by repeated temperature changes

When Should It Be Replaced?

Replacement is recommended whenever the O-ring shows cracking, distortion, flattening or evidence of oil leakage.

New seals should also be fitted when disconnecting the relevant gearbox oil cooler pipes, as previously compressed O-rings may no longer provide a reliable seal.

Installation Notes

Remove the old O-ring and carefully clean the sealing groove and mating surfaces.

Lightly lubricate the replacement seal with the appropriate transmission oil before installation, ensuring it sits correctly without twisting or stretching.

Reconnect the oil pipe securely and inspect for leaks after completing the repair. Follow Porsche's specified procedure if the transmission oil level requires checking or adjustment.

Key Features

  • OE Match aftermarket replacement O-ring
  • Dimensions: 12.25 x 2.5mm
  • Designed for PDK gearbox oil cooler pipe connections
  • Creates an oil-tight seal between mating components
  • Helps prevent transmission oil leakage
  • Suitable for Porsche 987.2, 981 and 718 Boxster/Cayman models
  • Ideal for gearbox oil cooler pipe servicing
  • Sold individually – 4 required per applicable vehicle assembly

OE Match Porsche Boxster & Cayman PDK Gearbox Oil Cooler O-Rings

The Porsche 987.2, 981 and 718 Boxster and Cayman PDK gearbox cooling systems use sealing rings at oil pipe connections to prevent transmission fluid leakage and maintain reliable oil circulation.

The OE Match O-ring, measures 12.25 x 2.5mm and provides a replacement seal for the relevant gearbox oil cooler pipe fittings. It is particularly useful when renewing transmission cooling pipes, repairing oil leaks or carrying out gearbox heat exchanger maintenance.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9P1301185A
9P1301185A
9G130789101
9G130789100

The product you are viewing cross references to these numbers
Special Order item
9P1301185A
Product Information
Product Information
O-ring PDK gearbox oil cooler pipe 12,25 x 2,5

Sold each - 4 required per car

Fits:
Porsche Boxster 987 MKII 2.9L 2009-12
Porsche Boxster S 987 MKII 3.4L 2009-12
Porsche Boxster 981 2.7L 2012-16
Porsche Boxster 981 S / GTS 3.4L 2012-16
Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
Porsche Cayman 2.9L 987C MKII 2009-12
Porsche Cayman S / R 3.4L 987C MKII 2009-12
Porsche Cayman 2.7L 981 2013-16
Porsche Cayman S / GTS 3.4L 981 2013-16
Porsche Cayman GT4 3.8L 2015-16
Porsche Cayman 718 2.0L PDK (300 Bhp)
Porsche Cayman S 718 2.5L PDK (350 Bhp)
Porsche Cayman T 718 2.0L PDK (300 Bhp)
Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L

Diagram ref no 30



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9P1301185A
9P1301185A
9G130789101
9G130789100

The product you are viewing cross references to these numbers
Special Order item
9G230725500
Product Information
Product Information
Retaining bracket plate PDK gearbox oil cooler. 

Fits:

Porsche Boxster 987 MKII 2.9L 2009-12
Porsche Boxster S 987 MKII 3.4L 2009-12
Porsche Boxster 981 2.7L 2012-16
Porsche Boxster 981 S / GTS 3.4L 2012-16
Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
Porsche Cayman 2.9L 987C MKII 2009-12
Porsche Cayman S / R 3.4L 987C MKII 2009-12
Porsche Cayman 2.7L 981 2013-16
Porsche Cayman S / GTS 3.4L 981 2013-16
Porsche Cayman GT4 3.8L 2015-16
Porsche Cayman 718 2.0L PDK (300 Bhp)
Porsche Cayman S 718 2.5L PDK (350 Bhp)
Porsche Cayman T 718 2.0L PDK (300 Bhp)
Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L

Diagram ref no 31



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9G230725500
9G230725500

The product you are viewing cross references to these numbers
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About Gearbox Oil Cooler

Porsche Gearbox Oil Coolers | Maintain Optimal Transmission Temperatures for Peak Performance

A gearbox oil cooler is essential for regulating transmission temperature and ensuring consistent performance under demanding driving conditions. By circulating and cooling the gearbox oil, it prevents overheating, protects internal components, and extends the lifespan of your Porsche’s transmission.

At Design911, we supply high-quality gearbox oil coolers engineered to meet or exceed original design standards. Built from robust aluminium and high-efficiency cores, our coolers deliver superior thermal management and fluid flow — ideal for both road and track applications.

Whether you’re servicing your Porsche, replacing a leaking cooler, or upgrading for enhanced performance, our gearbox oil coolers ensure reliable cooling and protection for every mile.

What Do Gearbox Oil Coolers Do?

The gearbox oil cooler dissipates the heat generated during transmission operation, maintaining stable oil temperatures for optimal performance and protection.

Core Functions:

  • Regulates gearbox oil temperature to prevent overheating.
  • Ensures consistent lubrication and hydraulic performance.
  • Protects seals, bearings, and internal components from heat damage.
  • Enhances efficiency and performance under load.
  • Extends the overall lifespan of the gearbox system.

Without a properly functioning oil cooler, the gearbox can overheat — leading to fluid breakdown, gear wear, and costly transmission damage.

Why Do Gearbox Oil Coolers Fail or Wear Out?

Gearbox oil coolers operate under high pressure and extreme heat. Over time, these conditions can cause blockages, corrosion, or leaks that reduce cooling efficiency.

Common Causes of Failure Include:

  • Corrosion or internal degradation from moisture or contaminated oil.
  • Leaks caused by damaged fittings or cracked cores.
  • Blockages restricting oil flow and heat transfer.
  • External damage from road debris or impact.
  • Deterioration of hoses and seals over time.

When an oil cooler fails, symptoms can include rising gearbox temperatures, oil leaks, fluid contamination, or transmission warning lights — all signs that replacement is required.

Why Replace Your Porsche Gearbox Oil Cooler?

Replacing or upgrading your gearbox oil cooler is essential to maintain safe operating temperatures, prevent gearbox wear, and ensure consistent performance. Performance-grade oil coolers are especially beneficial for track, towing, or high-torque applications.

Key Benefits:

  • Restores efficient gearbox temperature regulation.
  • Prevents overheating and oil degradation.
  • Improves transmission longevity and reliability.
  • Reduces thermal stress on internal gearbox components.
  • Designed for Porsche 911, Cayman, Boxster, Panamera, and PDK models.
  • Ideal for standard servicing, rebuilds, and performance upgrades.

Regular inspection and timely replacement of the gearbox oil cooler help maintain optimal performance and avoid major gearbox repair costs.

Highlights

  • Premium Porsche gearbox oil coolers engineered for reliability.
  • Efficient heat dissipation for manual, Tiptronic, and PDK gearboxes.
  • Durable aluminium construction with high-performance cores.
  • Prevents overheating and extends gearbox lifespan.
  • Perfect for maintenance, restoration, or motorsport applications.
  • Direct-fit replacements compatible with a wide range of Porsche models.

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