Why are there intermittent periods of excessive oil burning on a 92 Dodge Colt 100E with a 1.5 L Mitsubishi engine?

I had the same problem and the mechanic told me my seals were cracked. But then it wouldn't smoke again....in the winter, when the oil was thicker because of the cold. He suggested using 30w50 or close to racing weight as possible. I also used an oil additive by STP to stop smoking, and it really worked!