2005 F250 smoking at startup like a 2 stroke. 300hrs, 16 hours since oil change. Dealer decarboned cylinders 2 weeks ago and gave me fuel treatment. cranked motor on trailer before heading to river sunday and smoked for approx 5 minutes then cleared. cranked again today on trailer no smoke, but did notice oil level low. Where is oil going and why is it still smoking? Ant help appreciated.
