Ford Repair: 94 tempo, premium fuel, crankcase

Question
my car started to smoke very badly.it comes out of the ex. an the crankcase.It will start and run ok but the smoke is unreal.This happened 2 days after the warrenty (30 day) expired.Did they put somthing in it to keep it from smoking?What could be wrong?Thank you for any ideas.Julie

Answer
First make sure theres not too much in it, then change the oil and filter.  Run all the gas out of it, put premium fuel in it and run it on the expressway for awhile.  If it is smoking to the point where its gona get you pulled over, take it into a shop as it could be something serious.  Sucks about the warrenty.  Also, if the smoke is black, dont bother with the oil change as its a fuel problem and must be repaired.