993 Turbocharger Oil Scavenge Line Update [993-107-338-TK]Porsche 993 Turbo smoking upon start up? The most common reason a 993 Turbo smokes on startup is the turbochargers siphoning oil from the engine after shutoff. This over fills the drain reservoirs beneath the turbochargers, until oil pushes past the turbochargers' seals. TurboKraft's 993 Turbocharger Oil Line Update resolves this. Less common is the problem from oil draining into the turbochargers from the crankcase. If your 993 Turbo is experiencing