Rear Main Crankshaft Oil Seal. Porsche 958 Cayenne / 95B Macan / 970 / 971 Panamera 2009-20  ❭  95810115301

Rear Main Crankshaft Oil Seal. 
The OE MATCH Rear Main Crankshaft Oil Seal is a engine sealing component designed to provide a reliable oil-tight seal between the rear of the crankshaft and the engine block on compatible Porsche engines. This rear main seal prevents engine oil from escaping at the crankshaft exit point while allowing smooth crankshaft rotation, ensuring optimum lubrication and long-term engine reliability.  

Fits:

• Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
• Porsche 970.1 Panamera Diesel V6 3.0L 2011-13
• Porsche 970.2 Panamera Diesel V6 3.0L (250Hp) 2014-16
• Porsche 971.1 Panamera 4S Diesel V8 4.0L 4WD (422 Hp) 2017-18
• Porsche 971.1 Panamera 4S Diesel 4.0L Twin-Turbo V8 Sport Turismo 2017-18
• Porsche 95B.1 Macan S Diesel 3.0L V6 (258Bhp) 2014-18  

Diagram Ref No 39

The seal is engineered to withstand high crankshaft speeds, continuous thermal cycling, elevated oil temperatures and prolonged exposure to engine oil. Designed as a replacement, it provides fitment and dependable sealing performance, making it ideal during clutch replacement, engine rebuilds or preventative maintenance.  

What This Product Does:

• Prevents engine oil from leaking from the rear of the crankshaft.
• Maintains the integrity of the engine lubrication system.
• Provides a durable seal while allowing smooth crankshaft rotation.
• Helps protect the flywheel and transmission bell housing from oil contamination.
• Prevents dirt and moisture from entering the engine.
• Supports reliable engine lubrication and performance.
• Forms an essential part of the engine sealing system.

Symptoms Of Wear Or Failure:

• Engine oil leaking between the engine and transmission.
• Oil spots beneath the rear of the engine.
• Burning oil smell caused by oil contacting hot components.
• Oil contamination inside the bell housing.
• Clutch slipping due to oil contamination (manual transmission models).
• Gradual engine oil loss.Hardened, cracked or worn sealing lip.
• Excessive oil residue around the rear of the engine.
• Persistent oil leaks despite replacing nearby gaskets.
• Reduced engine reliability due to oil loss.

Why Replacement Matters:

• The rear main crankshaft oil seal operates in one of the most demanding areas of the engine, sealing against a continuously rotating crankshaft while being exposed to high temperatures, oil pressure and constant thermal cycling. Over time, the sealing lip can harden, wear or lose elasticity, allowing engine oil to escape.
• A leaking rear main seal can contaminate the flywheel, clutch assembly or transmission bell housing, potentially leading to clutch slippage, increased repair costs and reduced engine lubrication. If left unresolved, continued oil loss can accelerate internal engine wear and compromise long-term reliability.

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

95810115301

The product you are viewing cross references to these numbers