A used car can have any number of hidden problems that only become clear after ownership. It seems almost certain that this car was treated quite harshly by the past owner(s). It may even have had major modifications done to it that were removed and put back to stock prior to the sale.
Sorry to hear you are having issues. You can take at least some comfort in the fact you have a warranty. And looking at the bright side, you'll have a both a brand new engine and transmission (and whatever else you may have had replaced on these monthly dealership visits).
Originally Posted by passing
hope its nothing too serious and i hate to be that guy but........
ill buy the motor if its blown!!!
He is getting it replaced under warranty so the motor will go back to BMW.