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- 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 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Oil Pipe – Engine to Oil Thermostat
The Porsche 911 Oil Pipe connects the engine oil
system to the oil thermostat, allowing engine oil to flow correctly through the
external oil cooling circuit. This pipe is an important part of the Porsche 911
dry-sump lubrication system, helping route hot engine oil towards the
thermostat before it is directed to the front oil cooler when required.
Fits:
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Diagram Ref No 9
On air-cooled Porsche 911 models, correct oil circulation is essential for engine temperature control, lubrication, and long-term reliability. A damaged, corroded, restricted, or leaking oil pipe can reduce oil flow efficiency, cause oil loss, and compromise the cooling performance of the engine oil system.
This replacement oil pipe is ideal for Porsche 911 maintenance, restoration, engine rebuilds, and oil cooling system repairs.
What Does This Oil Pipe Do?
The oil pipe transfers oil from the engine towards the oil thermostat. The thermostat regulates whether oil is sent through the external oil cooler circuit, depending on operating temperature. When the engine oil reaches the correct temperature, the thermostat opens and allows oil to circulate through the cooler system, helping maintain stable engine temperatures.
A properly functioning oil pipe helps:
- Maintain correct oil flow from the engine to the thermostat
- Support efficient oil temperature regulation
- Protect the engine from overheating
- Preserve lubrication performance
- Keep the Porsche 911 dry-sump oil system operating as intended
Why Does This Oil Pipe Fail?
Porsche 911 oil pipes are exposed to heat, road debris, moisture, vibration, and oil system pressure. Over time, these conditions can cause deterioration, especially on older air-cooled models.
Common reasons for failure include:
- Corrosion on exposed metal pipe sections
- Damage from road debris or impact
- Cracked or weakened joints
- Oil leaks from ageing connections
- Seized or damaged fittings during removal
- Internal restriction caused by debris or old oil deposits
- Previous poor repairs or incorrect installation
Because these oil pipes are part of a high-temperature, high-use lubrication system, even minor leaks or restrictions should be treated seriously.
When Should You Replace It?
Replace the oil pipe if you notice visible corrosion, oil leaks, damaged pipework, crushed sections, poor fitting condition, or oil residue around the thermostat or engine connections.
Replacement is also recommended during:
- Engine removal or rebuild work
- Oil thermostat replacement
- External oil cooler system refurbishment
- Full restoration projects
- Preventative maintenance on ageing oil lines
- Repair of leaking or seized oil pipe fittings
Replacing the pipe before complete failure helps prevent oil loss, poor cooling performance, and potential engine damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010774315
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
Fits:
Porsche 911 3.0 03/74-07/83
Porsche 911 Turbo 3.0 01/75-07/77
Diagram Ref No 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91110774312
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 914 (1970-1976)
Fits:
Porsche 911 / 912 1969-76
Porsche 911 SC SPM 1978-83
Porsche 911 Turbo 3.0L 1975-77
Porsche 914
Diagram ref no 28
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90164163200
The product you are viewing cross references to these numbers