The best Grassroots Performance parts in this collection are its oil coolers: the direct-fit 19-row kit for the Subaru BRZ, Scion FR-S, and Toyota 86, the direct-fit 19-row kit for the Nissan 350Z, 370Z, G35, and G37, the universal 19-row and 25-row coolers, the dual pass competition cooler, and the auxiliary fan kit for the 19-row cooler. Check your year and model before ordering, and choose direct-fit when a kit is listed for your car.
An oil cooler adds a small radiator for engine oil, giving hard-driven cars more capacity to shed heat than the factory setup alone. Shoppers pick between direct-fit kits, packaged for a named application such as the BRZ, FR-S, and 86, and universal coolers for custom installs, sized by row count — 19-row and 25-row versions are both listed here. Some kits add filter relocation. Browse the wider oil system and cooling ranges for supporting parts.
Grassroots Performance is the single brand here, and oil cooling is its whole focus. Its signature piece is the direct-fit 19-row kit for the BRZ, FR-S, and GT86, which includes filter relocation, and the same format covers the Nissan 350Z, 370Z, G35, and G37. Beyond the kits, the range covers universal 19-row and 25-row coolers, a dual pass competition cooler, and an auxiliary fan kit for the 19-row cooler.
Mishimoto is the cooling name shoppers compare first, with a broad cooling range for the same Subaru, Nissan, and Toyota platforms. Where Grassroots Performance concentrates on oil coolers, Mishimoto covers more of the system around them, so the two are often combined on one build.
CSF is the radiator-focused alternative here. A cooler install is often planned alongside a radiator upgrade, which makes CSF the natural next stop after choosing an oil cooler. Check your year and model on both before ordering.
Koyo Cooling rounds out the comparison set with its radiators and cooling parts for Japanese performance cars, addressing the coolant side while Grassroots Performance addresses the oil side. Our guide to Subaru engine modifications explains where cooling support fits in a wider build.
Should I choose a direct-fit kit or a universal oil cooler?
Choose direct-fit when one is listed for your car: kits here cover the BRZ, FR-S, and 86 and the 350Z, 370Z, G35, and G37, all in 19-row form. Universal 19-row and 25-row coolers suit custom mounting and applications without a listed kit.
What does filter relocation do on these kits?
Filter relocation moves the oil filter as part of the cooler install, and it is included on the BRZ, FR-S, and GT86 direct-fit kit and on one of the universal kits. Check the product page for your application to see whether relocation is part of the package.
Do I need the auxiliary fan kit?
The auxiliary fan kit is listed for the 19-row oil cooler and suits builds that see low-speed or stationary running where airflow through the cooler is limited. Most street installs start with the cooler kit alone — check your year, model, and use case.
Is a tune required after fitting an oil cooler?
No. An oil cooler supports the engine's cooling without changing its calibration, so no tune is required. Plan on fresh oil and a careful check for leaks after any oil system install.
