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Oil System & Pipes

Oil System & Pipes

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Oil Cooler Pipe, Return. Porsche Boxster / Cayman PDK - 9G230708705
3
Oil Cooler Pipe, Return. Porsche Boxster / Cayman PDK
9G230708705/1
Product Information
Product Information

Oil Cooler Pipe - Return 

Restore the integrity of your Porsche's PDK transmission cooling circuit with this OE Match replacement oil cooler return pipe.

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 28

Designed for Porsche Boxster and Cayman models equipped with the PDK dual-clutch gearbox, this pipe forms part of the transmission oil cooling system, providing a return passage for oil circulating through the gearbox heat exchanger.

It is a practical replacement for an original pipe that has developed corrosion, damage or leakage.

What Does It Do?

The oil cooler return pipe carries transmission oil through the return side of the PDK gearbox cooling circuit.

During operation, the PDK transmission generates heat through its internal gears and clutch assemblies. The oil cooling system helps manage this heat by circulating transmission oil through a heat exchanger.

The return pipe completes part of this circulation route, allowing oil to flow back through the transmission cooling system.

Why Is It Important?

The PDK gearbox relies on correctly circulating transmission oil to maintain suitable operating temperatures and lubrication.

A damaged or leaking return pipe can result in:

  • Loss of transmission oil
  • Oil residue around gearbox cooling connections
  • Reduced efficiency of the oil cooling circuit
  • Potential gearbox overheating
  • Transmission warning messages if operating conditions become abnormal

Maintaining leak-free oil pipes helps protect the gearbox and supports dependable transmission operation.

Why Do Oil Cooler Return Pipes Fail?

Over time, the original pipe may deteriorate due to exposure to road salt, moisture, temperature changes and vibration.

Common causes of failure include:

  • Corrosion affecting exposed pipe sections
  • Damaged or deteriorated connection seals
  • Physical damage during gearbox maintenance
  • Fatigue around pipe bends or mounting points
  • Incorrectly secured or strained connections

When Should It Be Replaced?

Replacement is recommended when the return pipe shows visible corrosion, cracking, deformation or signs of transmission oil leakage.

It should also be inspected when investigating gearbox oil loss or servicing the PDK heat exchanger and associated cooling lines.

Any suspected transmission oil leak should be investigated promptly to prevent potential gearbox damage.

Installation Notes

Inspect the pipe mounting points, connection fittings and seals before installation.

Replace damaged sealing components as required and ensure the pipe is routed correctly without unnecessary strain. Use the manufacturer's specified tightening procedures.

Following installation, check the transmission oil level using the correct Porsche PDK service procedure and inspect all connections for leaks.

Key Features

  • OE Match aftermarket replacement oil return pipe
  • Designed for Porsche PDK gearbox cooling systems
  • Suitable for applicable 987.2, 981 and 718 Boxster/Cayman models
  • Carries oil through the transmission cooling return circuit
  • Replaces corroded, damaged or leaking original pipes
  • Helps restore correct gearbox oil circulation
  • Alternative to a genuine Porsche replacement component

OE Match Porsche Boxster & Cayman PDK Oil Cooler Return Pipes

The Porsche 987.2, 981 and 718 Boxster and Cayman PDK transmissions use an oil cooling circuit to regulate gearbox temperatures and support reliable operation.

The OE Match oil cooler return pipe provides a replacement for the original gearbox cooling return line. It is suitable for repairing damaged or leaking transmission oil connections on applicable PDK-equipped Porsche models.



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

9G230708705
9G230708705

The product you are viewing cross references to these numbers
Oil Cooler Pipe, Supply. Porsche 987.2 / 981 / 718 Boxster / Cayman PDK - 9G230708505
3
Oil Cooler Pipe, Supply. Porsche 987.2 / 981 / 718 Boxster / Cayman PDK
9G230708505/1
Product Information
Product Information

Oil Cooler Pipe – Supply

Maintain efficient gearbox temperature control with this OE Match transmission oil cooler supply pipe, designed for Porsche Boxster and Cayman models fitted 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 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 29

This replacement pipe provides a dedicated oil flow path within the gearbox cooling circuit, allowing transmission oil to reach the cooling system where excess heat can be managed.

An economical aftermarket alternative to the original Porsche component, it is ideal for replacing a leaking, corroded or damaged supply pipe.

For PDK transmission applications only. Not suitable for manual gearbox installations.

What Does It Do?

The oil cooler supply pipe transports transmission oil from the PDK gearbox towards the cooling circuit.

As the gearbox operates, friction and internal mechanical activity produce heat. The transmission cooling system helps remove excess heat by passing oil through a heat exchanger.

The supply pipe forms the feed side of this system, delivering oil for cooling before it continues through the return circuit.

Why Is It Important?

A dependable oil supply is essential for keeping the PDK transmission within its intended operating temperature range.

A faulty supply pipe may cause:

  • Transmission oil escaping from damaged pipework
  • Reduced oil volume within the cooling system
  • Oil staining beneath the vehicle
  • Insufficient oil circulation through the heat exchanger
  • Increased risk of gearbox overheating or damage

Maintaining the condition of the supply pipe helps preserve the performance and reliability of the transmission cooling circuit.

Why Do Oil Cooler Supply Pipes Fail?

The pipe is exposed to changing temperatures, vibration and environmental conditions throughout its service life.

Deterioration can occur through:

  • Corrosion from road moisture and salt
  • Fatigue caused by repeated heating and cooling
  • Damage to pipe connections or sealing surfaces
  • Contact with surrounding mechanical components
  • Accidental damage during transmission repairs

When Should It Be Replaced?

Renew the supply pipe if inspection reveals corrosion, cracks, deformation or oil seepage around its connections.

Replacement may also be necessary when carrying out repairs to the PDK gearbox cooling system, particularly if the original pipe cannot be safely reused.

Investigate any unexplained gearbox oil loss immediately to avoid possible transmission damage.

Installation Notes

Before installation, examine the heat exchanger connections, sealing rings and pipe retaining hardware.

Ensure the replacement supply pipe follows the correct routing and is securely fitted without twisting or placing stress on the connections.

Use the correct transmission oil and follow Porsche's specified PDK filling, temperature checking and oil level procedures. Inspect for leaks after installation.

Key Features

  • OE Match aftermarket replacement supply pipe
  • For applicable Porsche 987.2, 981 and 718 PDK transmissions
  • Delivers transmission oil to the gearbox cooling circuit
  • Helps maintain correct oil flow through the heat exchanger
  • Replaces damaged, corroded or leaking supply lines
  • Designed for the original pipe routing and connection arrangement
  • Cost-effective alternative to a genuine Porsche component

OE Match Porsche Boxster & Cayman PDK Gearbox Oil Cooler Supply Pipes

Porsche 987.2, 981 and 718 Boxster and Cayman models equipped with PDK transmissions rely on dedicated oil cooling pipework to help regulate gearbox temperatures during everyday driving and demanding operating conditions.

The OE Match oil cooler supply pipe, provides an aftermarket replacement for the transmission oil feed line. It helps restore the flow of gearbox oil through the cooling circuit when the original pipe becomes damaged or develops a leak.



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

9G230708505
9G230708505

The product you are viewing cross references to these numbers
Oil pipe, Return. Porsche Boxster / Cayman PDK - 9G230708705
3
Oil pipe, Return. Porsche Boxster / Cayman PDK
Special Order item
9G230708705
Product Information
Product Information
Oil pipe return.

Fits:
For cars with PDK transmission

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 28

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

9G230708705
9G230708705

The product you are viewing cross references to these numbers
Oil pipe, Supply. Porsche Boxster / Cayman PDK - 9G230708505
3
Oil pipe, Supply. Porsche Boxster / Cayman PDK
Special Order item
9G230708505
Product Information
Product Information
Oil pipe supply.

Fits:
For cars with PDK transmission

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 29

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

9G230708505
9G230708505

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 4 products)
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About Oil System & Pipes

Engine Cooling Oil System & Pipes – Precision Cooling and Lubrication for Porsche Performance

The engine cooling oil system and pipes play a crucial role in your Porsche’s performance and reliability. These components deliver and regulate oil flow between the engine, oil cooler, and filter, maintaining stable oil temperature and pressure. By keeping the oil cool and circulating efficiently, they help prevent overheating, reduce friction, and ensure smooth engine operation — even under extreme driving conditions.

At Design911, we offer a complete range of genuine and manufacturer-quality engine cooling oil system parts and pipes for Porsche models including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each component is engineered for precision fitment, high heat resistance, and long-lasting durability, ensuring your Porsche performs exactly as its engineers intended.

What Do Engine Cooling Oil System & Pipes Do?

The oil cooling system and its connecting pipes work together to control temperature and maintain lubrication efficiency throughout the engine. Their main functions include:

  • Transporting oil between the engine, oil cooler, and filter housing.
  • Dissipating excess heat from the oil to prevent breakdown under pressure.
  • Maintaining stable oil pressure for consistent lubrication.
  • Supporting overall engine temperature regulation alongside the coolant system.

These parts ensure your Porsche’s engine oil stays at the ideal temperature and viscosity, protecting vital internal components from wear and damage.

Why Do Oil System Pipes and Components Fail?

Even with regular maintenance, oil cooling system components can wear out due to heat, pressure, and age. Common causes of failure include:

  • Corrosion or cracking of metal oil pipes from long-term exposure to heat and oil.
  • Rubber hose degradation from high temperatures or oil contamination.
  • Leaks at connectors or fittings caused by vibration or poor sealing.
  • Blocked or restricted flow from sludge or carbon build-up.
  • Mechanical damage from debris or impact under the vehicle.

Signs of failure can include visible oil leaks, oil pressure warnings, overheating, or the smell of burning oil.

Why Replace Faulty Oil System Parts and Pipes?

A failing oil pipe or cooler line can cause oil loss, overheating, and even catastrophic engine failure if left unchecked. Replacing worn or damaged components ensures your Porsche’s oil circulation and cooling remain efficient and leak-free.

Benefits of replacement include:

  • Restored oil flow and cooling performance.
  • Prevention of leaks, overheating, and engine damage.
  • Improved reliability and efficiency under all conditions.
  • Manufacturer-quality materials for long-term durability.

All parts in this range are built from high-grade metals, reinforced hoses, and corrosion-resistant fittings, designed to meet or exceed factory standards for performance and longevity.

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