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PorscheBoxster 718 (982) 2017>>Boxster 25 Years 718 4.0L Manual (400 Bhp) 01/2020>>Gearbox / TransmissionTransmission Cooling

Gearbox Oil Cooler

Gearbox Oil Cooler

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DISPLAYING 1 to 4 (of 4 products)
O-ring PDK gearbox oil cooler pipe 12,25 x 2,5. Porsche 987.2 / 981 / 718 Boxster / Cayman - 9P1301185A, 9G130789101, 9G130789100
2
O-ring PDK gearbox oil cooler pipe 12,25 x 2,5. Porsche 987.2 / 981 / 718 Boxster / Cayman
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
O-ring PDK gearbox oil cooler pipe 12,25 x 2,5. Porsche 987.2 Boxster / Cayman / 718 Boxster / Cayman - 9P1301185A, 9G130789101, 9G130789100
2
O-ring PDK gearbox oil cooler pipe 12,25 x 2,5. Porsche 987.2 Boxster / Cayman / 718 Boxster / Cayman
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
Retaining bracket plate PDK gearbox oil cooler. Porsche 987.2 / 981 / 718 Boxster / Cayman - 9G230725500
3
Retaining bracket plate PDK gearbox oil cooler. Porsche 987.2 / 981 / 718 Boxster / Cayman
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
Retaining Plate for PDK Gearbox Oil Cooler Pipes. Porsche 987.2 / 981 / 718 Boxster / Cayman - 9G230725500
3
Retaining Plate for PDK Gearbox Oil Cooler Pipes. Porsche 987.2 / 981 / 718 Boxster / Cayman
9G230725500/1
Product Information
Product Information

PDK Gearbox Oil Cooler Pipe Retaining Plate

Ensure the gearbox oil cooler pipes remain securely fastened with this OE Match replacement retaining bracket plate for Porsche Boxster and Cayman PDK models.

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

This compact mounting component is used within the transmission cooling assembly to hold the oil cooler pipe connections in place. It helps maintain a stable fit between the connected components, reducing movement that could place unnecessary strain on the pipe fittings.

Ideal for replacing a missing, damaged or incorrectly seated original bracket during PDK gearbox repairs.

What Does It Do?

The retaining bracket plate provides mechanical retention for the PDK gearbox oil cooler pipe connections.

As the vehicle operates, engine and gearbox movement can create vibration around the transmission cooling components.

The bracket keeps the oil pipe fittings securely located, helping prevent movement or displacement at their mounting points.

Why Is It Important?

Although it does not carry or seal transmission oil itself, the retaining bracket plays an important supporting role in the gearbox cooling assembly.

A correctly installed bracket helps:

  • Hold oil cooler pipe connections in position
  • Maintain correct alignment between connected components
  • Reduce movement caused by vibration
  • Minimise unnecessary strain on pipe fittings and seals
  • Support secure assembly of the gearbox cooling system

A damaged or missing bracket may allow excessive movement, potentially affecting the security of the pipe connections.

Why Do Retaining Bracket Plates Fail?

These components are generally long-lasting, but damage can occur through mechanical stress or incorrect handling.

Common causes include:

  • Bending during oil cooler pipe removal
  • Damage from incorrect installation
  • Corrosion caused by moisture and road salt
  • Worn or damaged securing points
  • Accidental damage during gearbox maintenance

When Should It Be Replaced?

Replace the retaining bracket if it is bent, cracked, excessively corroded or no longer holds the oil cooler pipes securely.

It should also be checked whenever the transmission oil cooler pipes, heat exchanger or associated seals are removed for maintenance.

Installation Notes

Inspect the mounting area and confirm that the oil cooler pipe connections are fully seated before fitting the bracket.

Position the retaining plate correctly and secure it using the appropriate original fixing arrangement.

Check the surrounding pipe connections and sealing rings for damage. If the oil cooling circuit has been opened, follow the correct PDK servicing procedure and check for leaks after reassembly.

Why Choose OE Match?

OE Match provides replacement components for Porsche owners seeking an alternative to genuine Porsche parts.

This retaining bracket is intended to replace the corresponding original component while maintaining the factory-style mounting arrangement.

Key Features

  • OE Match aftermarket replacement retaining plate
  • Designed for PDK gearbox oil cooler pipe connections
  • Helps keep transmission cooling pipes securely located
  • Supports correct alignment of pipe fittings
  • Reduces unwanted vibration-related movement
  • Suitable for Porsche 987.2, 981 and 718 Boxster/Cayman PDK models
  • Useful for gearbox cooling system repairs and maintenance
  • Alternative to a genuine Porsche replacement part

OE Match Porsche Boxster & Cayman PDK Oil Cooler Pipe Retaining Brackets

The Porsche 987.2, 981 and 718 Boxster and Cayman PDK gearbox cooling assemblies use retaining brackets to secure the transmission oil cooler pipe connections and maintain their correct positioning.

The OE Match retaining bracket plate, is a replacement mounting component for applicable Porsche PDK gearbox oil cooling systems. It is particularly useful when repairing transmission oil cooler pipe connections or replacing damaged retaining hardware.



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

9G230725500
9G230725500

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 4 products)
Also found on these pages
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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