Oil drain plug O-ring. Porsche 993 1994-97  ❭  99970126940

Oil drain plug O-ring 11x2.5mm
For drain plug on thermostat housing.

The Porsche Genuine OE Oil Drain Plug O-Ring (Part No. 99970126940) is a factory-specified sealing ring designed for the engine oil drain plug on Porsche 993 models. This small but essential component forms a tight seal between the drain plug and the engine oil sump or tank, preventing oil leakage during operation and after routine oil changes.

Fits:
Porsche 993 1994 - 1997

Diagram Ref No 6

The oil drain plug O-ring sits around the drain plug sealing surface and compresses slightly when the plug is tightened. This compression creates a leak-proof seal that prevents engine oil from escaping around the plug threads.

By maintaining proper sealing, the O-ring helps ensure the engine lubrication system remains closed and secure, preventing oil loss and protecting surrounding components from contamination.

Fitment / Position on Car
•  Fitting position: Engine oil drain plug
•  Location: Between the drain plug and sump or oil tank sealing surface
•  System: Engine lubrication / oil service system

Functions & Technical Role
•  Leak prevention: Forms a tight seal around the oil drain plug
•  Compression sealing: Flexible rubber O-ring compresses when tightened to prevent leaks
•  Oil resistance: Designed to withstand continuous contact with hot engine oil
•  Service component: Recommended replacement during oil changes
•  OEM specification: Porsche-engineered dimensions ensure correct fit and reliable sealing

O-rings are designed to compress once to create a proper seal. Over time they can harden, flatten, or degrade due to heat and oil exposure, increasing the risk of leaks. Replacing the O-ring during oil service helps maintain a clean, leak-free engine oil system and protects surrounding components from oil contamination.

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Related, superseded, cross reference or alternative numbers for comparison.

99970126940

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