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Porsche // 997 (911) MK2 2009-2012 // 997 MKII Carrera C4S 3.8L 2009-12
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- 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 Manual (400 Bhp) 01/2020>>
- 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
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
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