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Oil Thermostat
By OE Match
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
This OE Match oil drain plug O-ring is a small sealing gasket designed for the oil drain plug on the oil thermostat housing in Porsche 911 (993) models. It provides a tight seal between the drain plug and the housing to prevent engine oil leaks during operation and after servicing.
Sold each
Fits:
Porsche 993 1994 - 1997
Diagram Ref No 6.
The oil drain plug O-ring is a rubber sealing ring installed on the oil drain plug located on the oil thermostat console or housing. Its function is to create a tight seal when the drain plug is tightened, preventing oil leakage from the engine lubrication system.
The OE Match version of part number 99970126940 is produced with the correct 11 × 2.5 mm dimensions, matching the original Porsche specification. This ensures proper compression and sealing performance when the drain plug is installed.
Because this component is removed whenever oil is drained from the thermostat housing, it is considered a service item and is commonly replaced during routine maintenance.
The O-ring seals the interface between the oil drain plug and the thermostat housing, preventing engine oil from leaking out of the lubrication system. It maintains proper oil pressure and protects the engine from oil loss.
Replacing the seal during servicing ensures the drain plug forms a secure seal and helps prevent oil seepage after maintenance.
Function
• Leak Prevention: Seals the oil drain plug on the thermostat housing
• Oil System Integrity: Maintains proper oil containment and pressure
• Service Seal: Designed to be replaced during oil system maintenance
• Engine Protection: Helps prevent oil loss and contamination
O-rings are exposed to heat, oil and repeated tightening cycles. Over time the rubber can harden, flatten or crack, which may lead to oil seepage or leaks around the drain plug. Replacing the O-ring whenever the plug is removed ensures the lubrication system remains properly sealed and helps prevent oil loss.
Consider replacing the O-ring when:
• Performing engine oil service
• Removing the oil thermostat housing drain plug
• The seal appears flattened, cracked or hardened
• Oil leakage is visible around the drain plug
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970126940
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Fits:
Porsche 993 1994-97
Click 'Zoom in' for large parts diagram.
Diagram Ref No 8.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99320735101
The product you are viewing cross references to these numbers
OEMatch Oil Thermostat — Fit, Function, Confidence
The oil thermostat controls oil flow to the cooler based on temperature, helping the engine reach operating temperature quickly and maintaining stable oil temperatures under load. Many owners search for genuine or OEM oil thermostat; these are direct-fit alternatives designed to match the original form, fit and function. OEMatch supplies components for Porsche models.
Available Types- Replacement thermostat assemblies
- Thermostat housings and seals
- Temperature sensors and gaskets
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original oil thermostat.
OE (Original Equipment) refers to parts matching original specifications for the oil thermostat and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM oil thermostat engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
The oil thermostat itself is a temperature-sensitive valve that diverts oil through the cooler when required; its operation helps reduce cold-start wear and prevents overheating during sustained high-load running. Typical construction uses heat-resistant alloys and durable seals chosen to tolerate long-term exposure to hot oil.
- Faster oil warm-up and reduced cold-start wear
- Improved temperature control during heavy use
- Consistent oil flow to protect bearings and seals
- Thermal fatigue from repeated heating and cooling cycles
- Oil contamination or sludge causing sticking or sluggish response
- Degraded seals or cracked housings leading to leaks and poor thermal response
A failing thermostat can cause erratic oil temperatures, increased engine wear and a higher risk of overheating. For Porsche owners, maintaining correct oil temperature is important to preserve engine clearances and the intended performance characteristics. Replacing ageing thermostatic components restores reliable temperature control and supports consistent lubrication across normal and demanding driving conditions.
Advantages- Coverage aimed at classic and modern Porsche models
- Materials selected for heat and corrosion resistance
- Suitable for routine servicing and engine rebuilds
