[thstone]

When the AOS fails you will get a smokescreen worthy of a James Bond getaway scene. Seriously. There will be no doubt when you see it. This can happen at start up but it will happen randomly while you're just driving down the road. By the time you pull over and let the smoke clear, the car will run normally.

Instead if you are seeing a momentary big puff of white/blue smoke occasionally on startup, this is somewhat normal. There can be several causes for this but if it only happens once every 6 months you can probably just live with it.