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Oil Thermostat

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DISPLAYING 1 to 10 (of 10 products)
96420704708/1KIT
Product Information
Product Information
Oil thermostat and hose kit.  This complete oil pipe kit is designed for the Porsche 964 Carrera’s dry-sump lubrication system, ensuring optimal oil flow and temperature regulation. The kit includes a oil thermostat (964 207 047 08), which automatically controls oil routing between the engine and front-mounted oil cooler based on temperature. By maintaining proper operating temperatures, this system helps protect engine components, improve performance, and extend engine life. 

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Related, superseded, cross reference or alternative numbers for comparison.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
96420704708
96420724101
96420724102
96420724104
96420725103
96420725404
96420725406
96420725407
96420725408
96420725414
96420724103
96420724105
96420724106
96420724107
96420724109

The product you are viewing cross references to these numbers
Special Order item
96420725103
Product Information
Product Information
Oil pipe rubber oil tank to thermostat.

Fits:
Porsche 964 1989-94

*For cars with Thermostat Part Number:
96420704705
96420704307
96420704308

Diagram ref no 22

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Related, superseded, cross reference or alternative numbers for comparison.

96420725103
96420725103

The product you are viewing cross references to these numbers
96420725103/1
Product Information
Product Information
Oil pipe rubber oil tank to thermostat.

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Related, superseded, cross reference or alternative numbers for comparison.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
96420725103
18223

The product you are viewing cross references to these numbers
Special Order item
96420713304
Product Information
Product Information
Oil pipe supply front cooler to thermostat.
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
96420713504
96420713304
96420713301
96420713303
96420713305

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96420713304/1
Product Information
Product Information
Oil pipe supply front cooler to thermostat.
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
96420713304
96420713301
96420713303
96420713305

The product you are viewing cross references to these numbers
Special Order item
96420734902
Product Information
Product Information
Oil Thermostat Insert.

 
porsche

Fits:
Porsche 964 1989-94

Click 'Zoom in' for large parts diagram.
Diagram Ref No 13.



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

96420734902
96420734902

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99970731440/1
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Product Information
Oil Thermostat O-Ring on Engine Case - 39.2 x 3mm
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
99970731440
99970717240
99970105340
99970105350

The product you are viewing cross references to these numbers
Special Order item
96420704708
Product Information
Product Information
Oil thermostat. Fits to oil lines.

porsche

Fits:
Porsche 964 1989-94

Please note: For early models with the early type thermostat you will also need:
96420724107 - Oil hose for thermostat
96420725103 - Oil pipe rubber (oil tank to thermostat)


Click 'Zoom in' for large parts diagram.
Diagram Ref No 11.

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

96420704708
96420704708

The product you are viewing cross references to these numbers
96420704708/1
Product Information
Product Information
Oil thermostat. Fits to oil lines.

mahle

Fits:
Porsche 964 1989-94

Please note: For early models with the early type thermostat you will also need:
96420724107 - Oil hose for thermostat
96420725103 - Oil pipe rubber (oil tank to thermostat)

Click 'Zoom in' for large parts diagram.
Diagram Ref No 11.

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

96420704708
96420704708

The product you are viewing cross references to these numbers
Special Order item
99970139340
Product Information
Product Information
Regulator Insert O-Ring.

porsche

Fits:
Porsche 964 1990-94
Porsche 993 1994-97

Click picture for large parts diagram.
Diagram Ref No 9.
DISPLAYING 1 to 10 (of 10 products)
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About Oil Thermostat

Oil Thermostats – Precision Temperature Regulation for Porsche Engines

The oil thermostat plays a vital role in your Porsche’s lubrication and cooling system by controlling oil flow based on temperature. It ensures that your engine oil warms up quickly to the ideal operating temperature and maintains stability during demanding driving conditions. This optimised oil temperature improves performance, efficiency, and long-term engine protection.

At Design911, we supply a range of oil thermostats and related components designed for reliability and accuracy across both classic and modern Porsche models. Manufactured using high-quality heat-resistant alloys and durable seals, our thermostats guarantee smooth operation, consistent flow control, and a perfect fit for your Porsche’s lubrication system.

Whether you’re maintaining a 911, Cayman, or Panamera, our oil thermostats deliver the precise temperature regulation your engine demands for both everyday use and performance driving.

What Do Oil Thermostats Do?

An oil thermostat regulates when oil is diverted through the oil cooler, based on temperature readings.

Core Functions:

  • Control oil flow between the engine and the oil cooler.
  • Ensure rapid oil warm-up to reduce cold-start wear.
  • Maintain stable operating temperatures during all conditions.
  • Protect against overheating under high loads.
  • Support optimal lubrication and efficiency.

By keeping oil within the correct temperature range, the thermostat helps your Porsche achieve consistent performance, better fuel economy, and extended engine life.

Why Do Oil Thermostats Fail?

Over time, continuous exposure to high temperatures, oil contamination, and mechanical wear can cause oil thermostats to degrade or malfunction.

Common Causes of Failure Include:

  • Sticking or seized valves due to sludge or varnish build-up.
  • Thermal fatigue from repeated heating and cooling cycles.
  • Cracked housings or worn seals, leading to leaks.
  • Oil contamination affecting thermal response.
  • Improper temperature regulation, causing overheating or slow warm-up.

Signs of a failing thermostat include oil temperature fluctuations, overheating, or delayed oil circulation, which can result in reduced engine protection and performance.

Why Replace Oil Thermostat Components?

A faulty thermostat can cause erratic oil flow, engine wear, or overheating. Replacing it with a high-quality, precision-engineered unit ensures reliable temperature control, smoother oil circulation, and consistent lubrication.

Key Benefits:

  • Restores accurate oil temperature regulation.
  • Prevents overheating and cold-start damage.
  • Improves oil flow and engine efficiency.
  • Built from heat- and corrosion-resistant materials.
  • Direct-fit compatibility with a wide range of Porsche models.
  • Ideal for servicing, engine rebuilds, or performance upgrades.

Replacing an ageing thermostat is an essential part of maintaining your Porsche’s lubrication system and preventing premature engine wear.

Highlights:

  • Precision-engineered Porsche oil thermostats for reliable control.
  • Ensures optimal oil flow and temperature regulation.
  • Constructed from premium heat-resistant materials.
  • Direct-fit design for 911, Cayman, Boxster, Panamera and more.
  • Ideal for routine maintenance or high-performance applications.
  • Maintains peak engine performance and longevity.

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