Process West Engine Oil Cooling System ( Part Number:PRW PWEOC01)

Process West Engine Oil Cooling System

Manufacturer Part # PWEOC01


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If you do any type of motorsport in your WRX or STi, you need to keep engine oil temps under control. The Process West engine oil cooler kit will remove 77-86 degree F off your oil temperatures at the circuit and at the same time take some load off the engine water cooling system.
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Brand: Process West
Color: Silver
Installation Hardware Included: Yes
Core End Tank Material: Aluminum
Core Rows: 8
Core Type: Bar and Plate
Oil Cooler Integrated Thermostat: No
Capacity: 600ml Additional

Mfgr. Warranty: 1 Year
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



Absolutely Incredible!
Jared A. 4 months ago
This fit incredible well on my Focus ST, literally nothing had to be modified to fit. The one thing I did have to change out was the oil filter(Due to the thread pitch being different on the pin that holds the sandwich plate up) , I ended up just going with a oil filter off a 2012 STI. So far under aggressive driving the Oil temps stay low and the Oil pressure looks great. Aside from having to let my car warm up a little bit longer this oil cooler is a 10/10.

2013 wrx sti
badlandsurf46419 2 years ago
This is a high quality product with an easy install. Looks bad ass and keeps the oil temp down during track days.

  • Q: Fittings  Bobsagget 8 months ago


    what size are the fittings? 10AN?

  • Q: Process West oil cooler  himvictor 1 year ago


    Would this fit if my 2009 WRX STI hatch if it has a Cusco Power brace front member installed? Also is it bad to have this if I daily my car in California?

    • A: We cannot confirm fitment with braces we have not tested. Colder climates typically will want a thermostatic sandwich adapter, but it is likely not needed for your area.

      Nick S. 1 year ago
  • Q: Thermostat  kechup147 2 years ago


    Is there a thermostat included with that kit ? Or does it not need a thermostat ? We have very cold winters in Canada so just want to make sure before I order haha, thanks!

    • A: The sandwich plate adapter included with this kit does not have a thermostat, and we recommend a thermostatic adapter if you live in a cold climate or if you use your car for daily driving because over cooling the oil will not allow it to lubricate as intended.

      Zach G. 2 years ago
  • Q: fitment   clarson89199 3 years ago


    will this oil cooler have any fitment issues on 08-14 wrx with a perrin fmic ??

    • A: As shown in one of the pictures. There should be no fitment issue with a FMIC

      Brady R. 3 years ago
  • Q: Fitment with invidia EL header  fatbastard 3 years ago


    I currently have invidia EL header installed. Will this kit fit?

    • A: This oil cooler should be compatible with the Invidia header, but we have not test fit them together, so we cannot guarantee compatibility at this time.

      Zach G. 3 years ago
Subaru Impreza
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