Mechanics

WHITE/GREY SMOKE WHEN STARTING UP

2006 BMW 750Li • 88,000 miles

Started emitting a huge puff of whitish/grey smoke upon start up. Only after the car has been sitting for an extended period of time. No sensors have come on in the car and the smoke does not continue while driving the car. Any ideas of what might the be problem.
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Tjbourque
January 4, 2012.



This is caused by oil in the cylinders from bad valve guide seals. Youll need to rebuild the heads to fix this. They my be able to replace the valve guide seals. Youll need to see if they can replace them with out removing the heads. Ty for using 2carpos

Cadieman
Jan 4, 2012.