1995 Ski Doo Summit 670

I have a 1995 Ski Doo Summit 670 I just bought runs great and compression is 140 in both cylinders but I noticed oil coming out of exhaust right at head area as well as at exhaust collector pipes. Any ideas what is causing this oil issue? It has 2300 miles on it. Now I only have had it idling in the driveway so maybe as it gets warmed up the oil issue goes away. Thank you

1995 Ski Doo Summit 670