prolly headgasket. FIll your antifreeze, and run the car. if you see airbubbles comming up in the resivior, your know is a broken headgasketso my sisters 97 4door has an oil leak, and she never checked the oil, theres was no oil in the car for some time, and i went to look at it, and changed the oil, and theres a grip load of white smoke coming out the exhaust, piston rings gone bad?