N54 Vacuum Side Oil Catch Can For BMW 135i, 335i, 535i, 1M (E Chassis)The BMS vacuum side N54 OCC works in conjunction with our world famous boost side N54 oil catch can to prevent engine oil and PCV gunk from coating your intake valves and hurting engine efficiency under engine vacuum operation. Our boost side OCC separates oil traveling through the PCV while the engine is operating under boost pressure (e. g. heavy throttle) and our vacuum side OCC separates oil traveling through the PCV while the engine is operating
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N54 Vacuum Side Oil Catch Can For BMW 135i, 335i, 535i, 1M (E Chassis)