blowing white smoke
 

I just bought a 2008 Mini Cooper S with 69,000 miles from a Mini dealer. It started to blow white smoke with a sweet smell. I took it back to dealer and they ran a check on everything and found nothing wrong, so finally determined they put to much ZMAXX in it. They changed the oil but said to run the gas out and see what happens as they could not drain it out. Not real sure i am agreeing with this diagnosis but went ahead and ran it down to almost empty, it is still smoking but it is running fine. Any ideas? The dealer did say they will take care of it but i was just wondering what to expect. Thanks