Join Date: May 2011
Location: Frederick MD.
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It's probably fuel smoke on start up, not oil. Is your oil level going down?
With 240k it's more likely that it's time to replace the injectors. When it starts up does it chug and have low power till it gets some heat in it? That's usually a sign of worn injectors.
Injector o-rings usually fail in 3 different ways.
1, compression gets by the copper sealing washer taking out the lower fuel rail o-ring, causing raw fuel to dump into the cylinder. When this happens it will white smoke heavily all the time and can hydro-lock the engine.
2, the upper fuel rail o-ring fails, allowing high pressure oil to get into the fuel system. High pressure oil pressure, 2500+psi, fuel pressure 40-60 psi, so high pressure oil pressure overcomes fuel pressure. This can happen and the truck will still run good, you just keep losing oil. When this happens you can usually tell by checking the fuel in the filter housing. If it's all black then you're probably getting oil in the fuel.
3, the upper o-ring on the injector for the high pressure oil rail will fail. This usually starts out as hard starts when warm, or a possible no start condition.
The other thing that happens is the injector cup itself will crack, allowing fuel to get into the coolant system. Coolant pressure roughly 16 psi max, fuel pressure 40-60 psi, so the fuel pressure overcomes the coolant pressure.
If you don't have fuel in the coolant I would NOT mess with the injector cups. It's a pain to do them in the vehicle and you can cause more problems then you'd fix. Kind of the ol' "if it aint broke don't fix it" thing.