Anodized aluminum billet oil cap for many General Motors vehicles. There are 2 different oil cap styles used on LS-based engines. This oil cap has special features that consolidate the differences. The top 7/8"-14 threaded port accepts 10AN ORB adapter fittings. Furthermore, it features internal stainless steel baffling that can be used for crankcase venting air/oil separation. 20-0539 OIL CAP, GM Anodized aluminum billet oil cap with a 10AN ORB plug to block-off the internal baffle. This is simply a replacement oil cap. Nothing else is required. Confirmed Engine Compatibility: LS1 LS2 LS3 LS4 LS6 LS7 LS9 LSA L76 L99 L9H LT1 LT2 LT4 NOTE: there are other compatible engines not listed. Optionally, the center 10AN ORB plug can be unscrewed and removed. Underneath is a cleanable and reusable stainless steel baffle for air/oil separation. Click HERE for a list of compatible 10AN ORB fittings to make a custom crankcase venting setup.
