I test drove a nice 95 318ti the other day, which fired a quick shot of blue smoke out of the exhaust. After a split second it was gone and I didn't get anymore smoke even during heavy acceleration.
The guy selling the car said that it always does that when it sits for a while, and that it is normal. My experience with cars (however limited) tells me that something is wrong and to run away now.
What do you think? Is this normal? The car had sat for about 3 months. Should I go back there and see if it does it again, or not bother looking at it?