Every now and then I get a cloud of white smoke from the tailpipe when I crank up my 05 f150 (5.4 with 21,000 miles) what could be causing this? the oil level is fine.I still have factory warranty, but I was thinking the dealer would probly just tell me everything is ok.

 

Hows the coolant level? White smoke is typically burning coolant.
It would also just be steam coming from condensation inside the engine and exhaust system.