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White exhaust is just water steam. It is usually only when it is cold out, and generally goes away as the engine heats.

Bluish-white exhaust means that oil is getting into the combustion chambers and is burning.

If you get a puff of bluish smoke when you start the car, it can mean that your valve seals are leaking.

If the blue smoke appears after about 30 seconds of the engine starting, and keeps on, then generally the piston rings are worn, letting lubricating oil into the combustion chamber.

Black-ish, sooty smoke means that the engine is most likely not getting enough air, especially if the smoke gets worse when you depress the gas pedal all the way. In an older car, black-ish smoke means that the car's choke is stuck in the closed or near-closed position. In newer cars, it's a different story, and one that I am not familiar with.

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