993 Turbocharger Oil Line Update [993-107-030-TK]Porsche 993 Turbo smoking upon start up? TurboKraft's oil line update package is the solution to this common problem! 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. Less common is the problem of oil draining back into the turbochargers from the crankcase. If your car has