The second cooler in our oil cooler range, offering an alternative to the OC-01 for builds with different mounting space or plumbing routes. The principle is the same: pass hot oil through a finned core sitting in clean air and return it to the engine at a workable temperature. Where the standard oil-to-water arrangement runs out of capacity, usually under repeated hard use, an air-to-oil cooler is the reliable fix. Plan the installation before you buy: the core needs unobstructed airflow, secure isolated mounting so vibration does not fatigue the fittings, and hose runs that avoid exhaust heat and suspension travel. Use oil-rated hose and correctly sized AN hose ends throughout.