[Jimbo409]

Had my boxster on a battery tender for 3 or 4 weeks while we were out of town. I went to start it yesterday and a bunch of white smoke came pouring out. I know the AOS causes this but it has never happened before.Is this from sitting for a few weeks or does it really need an AOS replaced, Is this normal if so what is the cost roughly to have this done by the dealer or independent. Thanks Jimbo