Oil Radiators / Heat Exchangers

Engine oil cooler gasket.



Fits:
Porsche 987.2 Boxster 2009-12
Porsche 981 Boxster 2012-16 Incl Spyder
Porsche 987C.2 Cayman 2009-12
Porsche 981C Cayman 2012-16 Incl. GT4
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13
Porsche 991.1 Carrera 2012-16
Porsche 991.2 Carrera 2017-18
Porsche 991 Turbo 2014-18
Porsche 955 Cayenne S / Turbo 4.5L 2003-06
Porsche 957 Cayenne S / GTS / Turbo 4.8L 2007-10

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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0PB115441

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Engine oil cooler gasket.



Fits:
Porsche 987.2 Boxster 2009-12
Porsche 981 Boxster 2012-16 Incl Spyder
Porsche 987C.2 Cayman 2009-12
Porsche 981C Cayman 2012-16 Incl. GT4
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13
Porsche 991.1 Carrera 2012-16
Porsche 991.2 Carrera 2017-18
Porsche 991 Turbo 2014-18
Porsche 955 Cayenne S / Turbo 4.5L 2003-06
Porsche 957 Cayenne S / GTS / Turbo 4.8L 2007-10

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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0PB115441

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Engine oil heat exchanger.



Fits:
Porsche 955 Cayenne S 4.5L 2003-06
Porsche 955 Cayenne Turbo 4.5L 2003-06

Click 'Zoom in' for large parts diagram.
Diagram ref no 18

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94810727603

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Engine Oil Heat Exchanger.
Maintain correct engine oil temperature and reliable lubrication with this OE Match Engine Oil Heat Exchanger, manufactured as a direct replacement. Produced to OE-style specifications, this heat exchanger transfers heat between the engine oil and coolant, helping the engine reach its optimum operating temperature more quickly while preventing excessive oil temperatures during normal driving and high-load conditions.

Fits:

• Porsche 955 Cayenne S 4.5L V8 2003-06
• Porsche 955 Cayenne Turbo 4.5L 2003-06  

Diagram Ref No 18

Over time, the original heat exchanger can suffer from internal corrosion, blocked passages, seal deterioration, or leaks between the oil and coolant circuits. A failing unit can reduce cooling efficiency, contaminate fluids, and lead to serious engine damage if left unchecked. This OE Match replacement restores dependable temperature regulation and lubrication performance, making it ideal for routine maintenance and long-term reliability.

What This Product Does:

• Regulates engine oil temperature.
• Transfers heat between the engine oil and coolant.
• Helps the engine reach operating temperature more quickly.
• Prevents excessive oil temperatures under load.
• Supports efficient engine lubrication.
• Maintains OE-style cooling performance.
• Replaces worn, leaking, or damaged original heat exchangers.

Symptoms Of Wear Or Failure:

• Engine oil contaminated with coolant.
• Coolant contaminated with engine oil.
• Rising engine oil temperatures.
• Reduced engine cooling efficiency.
• External oil or coolant leaks.
• Overheating during heavy driving conditions.
• Milky residue in the oil or coolant system.
• Corrosion on the heat exchanger housing.
• Engine warning lights relating to cooling performance.
• Age-related deterioration of the original unit.

Why Replacement Matters:

• The engine oil heat exchanger is a critical component in maintaining stable oil temperatures and protecting the engine under all operating conditions. A leaking or inefficient heat exchanger can lead to oil and coolant contamination, poor lubrication, overheating, and potentially severe engine damage if not addressed promptly.
• Replacing a worn or faulty heat exchanger restores efficient thermal management, protects vital engine components, and helps maintain reliable performance. Manufactured to OE-style specifications, this OE Match replacement provides the correct fit, dependable operation, and long-lasting durability for maintaining your Porsche to factory standards.

Related reference numbers
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94810727603

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Engine oil heat exchanger.

Fits:
Porsche 955 Cayenne S 4.5L 2003-06
Porsche 955 Cayenne Turbo 4.5L 2003-06

Diagram ref no 18

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94810727603

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O-ring - 21.2 x 3.55 - for the metal coolant supply pipe which directs coolant to the oil cooler inlet hose and the alternator coolant supply hose. 

Fits:
Porsche 955 Cayenne S 4.5L V8 2003-06
Porsche 955 Cayenne Turbo 4.5L V8 2003-06

Diagram ref. 2. 


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99970753740

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Water Cooling Pipe System Upgrade

The OE Match Water Cooling Pipe System Upgrade is a permanent solution to one of the most common and well-known cooling system failures affecting the first-generation Porsche 955 Cayenne 4.5L V8 S and Turbo models built between 2003 and 2006.

Fits:

• Porsche 955 Cayenne S 4.5L V8 2003-06
• Porsche 955 Cayenne Turbo 4.5L 2003-06
• Porsche 955 Cayenne Turbo S 4.5L 2006>>

Diagram ref Nos 7, 9, 10, 11, 12, 13, 16 and 17

The original factory cooling system uses a series of plastic coolant pipes located beneath the intake manifold to carry coolant between the engine block, thermostat housing and cylinder heads. While perfectly adequate when new, years of repeated heat cycles cause these plastic pipes to become brittle and lose their structural integrity. Eventually they can soften, crack or separate from their bonded joints, leading to sudden coolant loss and rapid engine overheating.

Porsche later introduced an improved aluminium pipe design to eliminate this weakness. This OE Match upgrade kit replaces the original plastic coolant pipes with durable alloy replacements, providing a long-term repair that is far more resistant to heat, pressure and age-related deterioration.

A failed coolant pipe can result in coolant leaking into the engine valley beneath the intake manifold, where it may initially go unnoticed. Drivers often first discover the problem through unexplained coolant loss, coolant odours, warning messages or engine overheating. Continuing to drive with a leaking pipe can lead to severe engine damage, making early replacement a wise preventative maintenance upgrade.

Replacement is strongly recommended if the intake manifold is already being removed for other engine work, such as starter motor replacement, knock sensor replacement or general engine servicing. Many owners also choose to install the alloy upgrade proactively once their Cayenne reaches higher mileage or shows signs of cooling system deterioration.

Features & Benefits

• OE Match alloy water cooling pipe upgrade kit
• Replaces the original plastic coolant pipes
• Eliminates a common failure point on early 4.5L V8 engines
• Improved resistance to heat and coolant pressure
• Reduces the risk of sudden coolant loss and engine overheating
• Ideal preventative maintenance upgrade
• Suitable for Porsche 955 Cayenne 4.5L S and Turbo models (2003-2006)
• Direct replacement for the original cooling pipe assembly

Porsche 955 Cayenne Alloy Water Cooling Pipe Upgrade

The first-generation Porsche Cayenne is renowned for its performance and versatility, but owners of the early 4.5-litre V8 models are often familiar with the factory plastic coolant pipe issue. Upgrading to the later alloy pipe design is widely regarded as one of the most important preventative maintenance improvements for these vehicles.

At Design911, we supply high-quality OE Match cooling system components that restore reliability while maintaining original fitment standards. Whether you're carrying out preventative maintenance, repairing a coolant leak or rebuilding your engine, this alloy coolant pipe upgrade offers lasting peace of mind.

Why Upgrade to Alloy Coolant Pipes?

Unlike the original plastic pipes, alloy pipes are unaffected by prolonged exposure to engine heat and pressure. Once installed, they provide a significantly more durable cooling system capable of withstanding the demanding operating temperatures of the Porsche V8 engine.

Common Symptoms of Failing Plastic Coolant Pipes

• Unexplained coolant loss
• Coolant smell after driving
• Coolant pooling beneath the intake manifold
• Low coolant warning messages
• Rising engine temperatures or overheating
• Steam from the engine bay

Replacing the plastic coolant pipes before failure helps avoid costly overheating repairs and significantly improves long-term engine reliability

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948106059KIT

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