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Oil Thermostat
By OE Match
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
All pipes and fittings are precision-engineered to meet factory specifications for perfect fitment and reliable, leak-free operation.
Fits:
Porsche 964 - 1989 to 1994
Kit includes
1 x Oil thermostat
1 x Oil hose - thermostat to oil tank
1 x Oil hose
- thermostat to oil tank
1 x Oil hose - thermostat to oil filter housing
Diagram Ref No 21, 22, 46 and 11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96420704708
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Fits:
Porsche 964 1989-94
*For cars with Thermostat Part Number:
96420704705
96420704707
96420704708
Diagram ref no 22
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96420725103
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
These are long pipes running down the side of the car
Fits:
Porsche 964 1989-94 3.6L
Porsche 964 Turbo
Diagram Ref No 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96420713304
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
Oil Pipe – Thermostat to Oil Filter
The Porsche 964 Oil Pipe from the thermostat to the oil
filter is a critical component within the engine's lubrication and oil cooling
system. Designed specifically for Porsche 964 models produced between 1989 and
1994, this oil line transfers engine oil between the thermostat assembly and
the oil filter housing, ensuring continuous oil circulation and filtration
before oil is distributed throughout the engine.
Fits:
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
Diagram Ref No 46
The Porsche 964 relies on a sophisticated dry-sump lubrication system that not only lubricates critical engine components but also assists in engine cooling. This oil pipe plays an important role in maintaining correct oil flow, pressure, and filtration efficiency, helping to protect the engine under both normal driving and high-performance conditions.
Whether you are restoring a Porsche 964, rebuilding an engine, or repairing a leaking oil system, replacing ageing oil pipes is essential for maintaining reliability and preventing costly engine damage.
What Does This Oil Pipe Do?
The thermostat-to-oil-filter pipe forms part of the engine's oil circulation circuit.
Its primary functions include:
- Transporting oil between the thermostat and oil filter housing
- Maintaining uninterrupted oil flow through the lubrication system
- Ensuring oil passes through filtration before recirculation
- Supporting stable oil pressure throughout the engine
- Assisting the operation of the Porsche dry-sump oil system
- Helping maintain proper engine cooling and lubrication
Without a properly functioning oil pipe, oil flow can be compromised, placing the engine at risk of lubrication issues and overheating.
Why Does This Oil Pipe Fail?
The oil pipe operates in a demanding environment where it is constantly exposed to heat cycles, oil pressure, vibration, road contamination, and age-related deterioration.
Common causes of failure include:
- Corrosion of metal pipe sections
- External damage from road debris
- Fatigue from vibration and engine movement
- Deterioration of sealing surfaces
- Cracked or weakened pipe connections
- Oil contamination and sludge build-up
- Damage during previous repairs or engine removal work
- Age-related wear on original factory-installed lines
As the vehicle ages, corrosion and fatigue become increasingly common, particularly on original oil system components.
Common Symptoms of a Failing Oil Pipe
Signs that the thermostat-to-oil-filter pipe may require
replacement include:
- Visible oil leaks
- Oil residue around the pipe or fittings
- Corrosion on exposed metal sections
- Reduced oil pressure
- Oil smells from the engine bay
- Damaged or crushed pipework
- Difficulty removing seized fittings during servicing
Because the oil system is vital to engine protection, even small leaks should be addressed promptly.
When Should You Replace It?
Replacement is recommended when:
- Oil leaks are present
- Corrosion becomes visible
- Pipe fittings become damaged or seized
- During engine rebuilds
- During oil thermostat replacement
- During major oil system refurbishment
- As part of preventative maintenance on ageing vehicles
- During restoration projects where long-term reliability is a priority
Replacing ageing oil lines before failure helps prevent oil loss, lubrication issues, and expensive engine repairs.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96420725414
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- 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 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- 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
OE Match oil thermostat O-ring on engine case, 39.2 x 3mm, for Porsche 911, 914-6, 964, and 993 models. This replacement sealing O-ring helps prevent oil leaks at the engine-mounted thermostat area and supports correct engine oil system sealing.
Fits:
Porsche 911 - 1970 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1997
Porsche 914-6 - 1970 to 1976
Diagram ref no 34
The O-ring seals the joint between the oil thermostat and engine case. A correctly fitted seal helps prevent oil seepage, maintain oil system integrity, and keep the engine area clean and leak-free.
Functions
• Replaces the oil thermostat O-ring
• Seals the thermostat connection on the engine case
• Helps prevent engine oil leaks
• Supports correct oil system sealing
• Suitable for oil thermostat, engine case, or oil leak repair
• Replaces hardened, flattened, cracked, swollen, or damaged O-rings
• OE Match replacement for Porsche engine oil system service.
Why Replace This Part?
Oil thermostat O-rings can harden, flatten, crack, swell, or lose sealing ability due to heat, age, oil exposure, and pressure cycles. A worn or damaged O-ring may allow oil seepage around the thermostat area, causing oil residue, low oil level concerns, engine bay contamination, or failed inspection. Replacement is recommended whenever the thermostat is removed or oil leakage is present.
When to Replace This Part
• Oil is leaking around the engine-mounted thermostat area
• The oil thermostat has been removed or serviced
• The O-ring is hard, flattened, cracked, swollen, or damaged
• Engine case sealing work is being carried out
• Oil seepage or oil residue is visible around the thermostat connection
• Preventative replacement is required during engine service
Where it fits on the car
This O-ring fits at the oil thermostat connection on the engine case. It forms part of the engine oil sealing system on Porsche 911, 914, 964, and 993 models.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970731440
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
