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You've finally pushed your Subaru to its limits, and it's time to upgrade that cooling system so you can push even harder. Introducing the Grassroots Performance 19-Row Oil Cooler Kit for the Subaru WRX and STI. Our kit is simple and effective, like any modification you make to your vehicle should be. With our race-proven 19-row oil cooler core, this kit is based around a cooler you can trust. Equipped with our -10AN in/out oil lines to provide a solid amount of oil flow throughout the entire oil cooler kit. Backed by our Lifetime Warranty you can have peace of mind because we've got you covered. 

The direct-fit block adapter is designed specifically for Subaru engines only. We keep things simple with a free-flowing block adapter that looks just as good as it performs. The block adapter supplies the in/out -10AN oil lines feeding and returning the oil cooler. The Subaru block adapter also has 2 ports for a 1/8 NPT oil outlet. This means you can run an oil temp gauge or oil pressure gauge with an easy hassle-free install. 

Utilizing the 19-Row Oil Cooler you can expect to see a drop in oil temperature anywhere from 17-24 degrees Fahrenheit. Yes, that means more laps going that much harder.

Combine your oil cooler kit with our Grassroots Competition Oil Filter and you have the complete package. Check out some specs on our Competition Racing Oil Filter HERE.


  • Cooler Mounting bracket not included
  • 2006-2007 WRX requires Subaru Part #21328AA140 Crossover pipe
  • 2004-2007 STI requires Subaru Part #21328AA140 Crossover Pipe

  • [1] 19 Row Oil Cooler  
  • [1] -10AN 90-Degree Swivel Fittings Installed on Both Ends to 47" Line (Adjustable Length)
  • [1] -10AN 90-Degree Swivel Fittings on Both Ends Installed to 62" Line (Adjustable Length)
  • [1] Adapter Plate with supply and return ports + (2) 1/8th NPT ports
  • [2] 1/8th NPT Block off plugs
  • [2] Block Adapter AN Fittings
  • OPTIONAL Grassroots Competition Oil Filter