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How to tell what your exhaust smoke colour means (and when to worry)

Blue or grey smoke means the engine is burning oil, usually from worn piston rings, valve seals or a failing turbo seal, and ...
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Thick smoke is billowing out of my car's exhaust, can I tell what's wrong from the colour?

I was driving back from work in the evening and in my rear view mirror noticed excessive smoke coming out of my car's exhaust. I didn't notice the engine behaving differently, but I was fortunately ...