I have twice noticed that my CLK430 Cabriolet with 35k miles occasionally emits a good sized puff of whitish blue smoke. Maybe once every 10 starts. Any cause for concern?

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2002 500SL(Black/Black)
1992 300SE(Black/Black)
1992 190E 2.3(White/Navy)
1999 VW Jetta TDI(Pearl Green)
1986 SAAB 900 Base 3 door(White)
1983 Porsche 911SC(Chiffon)
1977 VW Scirocco(DiamondSilver)

Could be a leaky injector.

most likely Valve guides normally when you drive the oil is pumped up to the top of the cylinder head, upon shutdown if you have too much tolerance in valve guides the oil will "slither" down the valve stem into the piston and wait there held by the piston rings until you crank it up and burn off on initial startup, hard to belive in such a low mileage car, I would switch to Redline Synthetic straight 30Weight oil and see if that corrects the problem

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Jerry

2004 SL500 Black 55K Miles
2002 s500 Black 90K Miles
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles