Subaru Genuine Oil Cooler Unit – Subaru WRX & STI 01-05/LGT 04-09 (EJ20/EJ25) – 21311AA051
This device cools engine oil through oil-to-air or oil-to-water cooling to remove excess heat. It is required for engine rebuilds due to bearing failure or metal particles in the oil.
- The description claims this device is required for engine rebuilds where bearing failure is evident or metallic material has passed through the oiling system.
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