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2007 Mercedes-Benz SLK280 Question: I started the engine and a big puff of blue smoke appeared. It only happened once.

 

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Visitor, Tucson, AZ, February 22, 2011, 14:18

what would cause a big puff of blue smoke when starting the engine after sitting over night, it only happened once.!!

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  • Answer #1

    ZeeTech February 22, 2011, 16:55
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    Usually this is a sign of the failed valve stem seals. Some oil sweeps through the seals and burns in the combustion chamber at the next start.

    Zee

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