I just bought my mk3, its got about 50k on engine and tranny, its BURNING through oil tho, i dont think its leaking, but its drinking a considerable amount, whats up with that bad piston rings? And ive been wondering what should my oil pressure be its around 13-17 pounds per thousand rpms, how much pressure is to much? advice appreceated, Any tips on maintaining my engine that only a supra veteran would know?