oil in the fueline,gas tank, ruined turbo.

[puzzled]

my 04 xc90 became very sliuggish and lost power. it would not get to 60mph. i got it to a dealer who hasnt figuired out the problem. he is replacing one turbo that he said was ruined. the car also smoked when running. any similiar problems or suggestions?

[Guest]

First off, how did you get oil in the fuel supply line? And how much oil? If you got oil in the fuel line, your vehicle would be sluggish because the fuel filter is clogged by the oil. Depending how severe the oil contamination was, it could just be that the fuel tank and lines need flushing. Also replace the fuel filter. The fuel injection too could be affected, not being able to meter the fuel and or the fuel injectors could be clogged, causing a bad spray pattern and fuel oil/air mixture. I don't believe the turbo could be effected by oil contamination. The turbo essentially compresses air to a high map (manifold air pressure). This compression air (and only air) is dumped into the compression chamber of the engine when the intake valves open. The fuel injectors at the same time spray the atomized fuel into the compression chamber, while the piston is on the downstroke. On the upstroke the intake valves close (exhaust valves are closed too) and the piston compressions the fuel air mixture and when the piston reaches past TDC (Top Dead Center, a few degrees or so..) the spark plug fires, igniting the fuel/air mixture, causing a control explosion, pushing the piston downwards. This provides the kinetic energy to the crankshaft which propels the vehicle.. essentially.

All the turbo does is provide higher pressure, the higher the compression of air the more power the explosion and more out put power from the engine.
Turbochargers are suspectible to oil coking at the bearing surface areas. Oil coking can occur if low oil or too much oil is present within the Turbocharger case. Turbochargers rotate at a very high rpm, creating tremendous heat; however there has been alot of improvements in automobile turbocharging technology over that last 20 years. Turbo's have been around since early piston driven airplanes. Like anything, maintenance is key.

However, oil in the fuel tank will not damage the Turbocharger. (Turbo's are expensive component... I would get a second opinion.) Have your boyfriend or husband take the car into another dealer for their opinion.. please don't take offense.

Good luck.