Most people’s initial reaction when they see white smoke coming out of their exhaust, is to assume the worse…..blown headgasket, slipped cylinder lining, catastrophic engine failure. While on rare occasion that is the case, many times it is nothing more than a bad Oil Air Separator (OAS, AOS, Air Oil Separator, etc). 996, 997’s, and Boxsters use an oil air separator which basically reduces oil vapor that recirculates in the engine. Unfortunately, they use a rubber diaphragm that is prone …