Porsche 944 S2 / 928 Oil Cooler Adapter

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SKU: EPR-100
Regular price $119.00

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Improved Racing's oil cooler adapter for the Porsche 944 S2 and late model 928 allows you to convert the aging factory oil cooler lines to AN lines or connect an aftermarket oil cooler. Because the factory lines have been discontinued, this is often the only option available.

The 944 S2 uses these twin ports on both the engine block and oil cooler. The adapter fits the factory oil cooler and will bolt up to the block, the there is not enough clearance for fittings with the factory timing cover in place. Modifications are required to make this adapter work on the engine block side of the 944 S2 engine.

The later year (1990-1995) Porsche 928 generally uses these twin ports on the engine block side only. Some 928 models may have an oil cooler with these twin ports as well, but more commonly they are independent ports on opposite ends of the cooler.

The oil line ports are -10AN O-ring boss ports and adapters are available for -10AN and -12AN lines.

Features and Benefits

  • Bolts directly to the factory engine block and oil cooler, allowing an aftermarket oil cooler or aftermarket AN lines to be used
  • -10AN (JIC/SAE) O-ring boss ports for oil lines
  • CNC-machined 6061-T6 billet aluminum construction with MIL-A-8625 Type II black anodized finish
  • FKM (Viton) O-ring seals for maximum temperature range, fluid compatibility, longevity and reliability
  • Lifetime Warranty
  • Made in the USA

Optional Adapter Fittings Available in -10AN or -12AN


  • 1x Oil cooler adapter
  • 2x Viton (FKM) O-ring seals
  • 1x M8 Mounting screw


  • 1989-1991 Porsche 944 (S2), oil cooler side
  • 1990-1995 Porsche 928, engine side


Part #
EPR-100 Configurator
Improved Racing
Primary Material
6061-T6 aluminum
Type II Anodized
Minimum Operating Temperature
-40°F (-40°C)
Maximum Operating Temperature
302°F (150°C)
Inlet Port Size
-10AN O-Ring Boss Female
Outlet Port Size
-10AN O-Ring Boss Female
Maximum Operating Pressure
300 psi (20.68 bar)
Max Recommended Flow Rate
Up to 20 GPM (76 LPM)
Fluid Compatibility
Engine oil
Transmission fluid


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