Newb with question
 

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

Not a mechanic, but are you putting premium gasoline?

The dealer filled the car up when i purchased it. I am not sure what grade they put in it. When i ran that tank through, i added $20.00 worth of gas and i put in mid grade which is 89 octane here in Ga. Dealer advised me that car needs 91 octane and here we have 92 and 89 so they said to switch from one to the other on each tank.