The vehicle has not ran hot. it has 280,000 miles on it but has been taken care of. Could it possible be the valve stem seals allowing a little oil to seap by? It does not do it everytime i crank the car. the smoke does not smell sweet like coolant is blowing out. when you check the oil on the dipstick, it looks ok. it does not have a milky appearance like the headgasket is cracked or leaking.