If my car's engine is off for at least 6-7 hours I get this strange puff of blue-ish smoke when I sart the engine. It goes away after a few seconds, although not without having caused an intense cloud of smoke that is frankly quite embarrassing..
This issue started after I got an oil change in December 2009. During the same visit to my mechanic (who specializes in Porsche) they changed my air-oil separator as ''preventative maintenance''...
Last month I let my mechanic have a look at my car for a few weeks (was on vacation) to try and figure out exactly why smoke was coming out of the exhaust on startup. The only thing he did was replace the air-oil separator but it has not solved the problem as today my car puffed a bit of smoke after I left work. (car was sitting for 10 hours)
I read somewhere that sometimes over-filling an engine with oil can cause this problem.
Do you think my mechanic messed up my oil change or is it simply bad luck? It sure isn't the air-oil separator because that has been changed twice in less than a year.