Immediately following a "tune up" my craftsman LT2000 riding mower made huge clouds of white smoke , NEVER had this before , the tune-up service says that nothing they did could have caused this.. . I wonder... too muck oil? stood mower upright to change the blades and oil in engine? They did put 64 oz back into a 48oz capacity, any ideas to save my mower?

Drain oil and start over.