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Does it do it on every start up, or only after the car has sat for a couple of days? I think the latter is fairly normal, as some oil mist will get pulled through the AOS into the intake manifold. When my car sits for a several days, I'll get a puff of smoke on startup as I believe the oil vapor condenses on the walls of the intake, and given time, will flow down the intake to the intake valves. Its not a lot of oil, but it does make a good size puff of smoke that first start, but its only for a second right after start. After that, no more visible smoke if daily driven. My crankcase vacuum looks good, so I'm assuming the AOS is functioning OK.
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