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I would check for a defective PCV valve. If it has not been changed, I have seen cases where they suck the oil right out of the engine. Depending on the mileage, I wouldn't be concerned over a small puff of smoke when starting the engine. Thanks.
If it's blue-white then What you might be seeing is oil burn-off from leaking valve guide seals. The next time you have the oil/filter changed, have a high mileage oil installed. - See more at: http://community.cartalk.com/discussion/2294478/white-smoke-coming-from-the-tail-pipe#sthash.jVo0zDhw.dpuf
Sorry but white smoke is a sign of water getting into 1 or more cylinders.I would pull the oil dipstick and see if it looks like a creamy color.If it does then you may have a blown head gasket or a crack in the engine block somewhere.
what colour smoke ?? blue smoke is oil ,worn rings or valve guides ,or oil seeping into cylinder where oil passes through head gasket to lubricate cam ,white smoke is water ,head gasket ? black smoke is excess fuel
although mercedes recomend using synthetic motor oil im 90% sure that your mechanics mistake (putting to much oil in it) ruined your piston rings thats what the white smoke is all about!! oil is getting into the cylinders!! make him replace them for free since he caused that prblem im sure he has insurance!!
white smoke is water blue smoke is oil. nest time try and smell the white smoke see if it smells sweet? if it does its antifreeze. and also black smoke is fuel (like a leaky injector ) hope this helps paul