I have a Pontiac that has that problem and it comes from the intake manifold gasket. This could be your issue. If not, it could be that the head gasket is failing on the oil pressure side.
SOURCE: 1999 Isuzu oil in coolant reservoir
If oil is geting in the coolant, you most likely have a leaking head gasket. there is one other item it could be if it has an automatic transmission, and that is the transmission cooler in the radiator, if the cooler is leaking it will allow transmission fluid to mix with the coolant.
SOURCE: coolant loss with no signs of overheating
check the bottom of you coolant bottle to see if you have a crack and check all of you hoses as well try this website to see if the have your car listed its www.alldatadiy.com hope this help you Michigan Man.
SOURCE: 1990 BMW 735i: oil in the coolant reservoir
If your car is an automatic there would be lines from the transmission to the rad to cool the transmision fluid. Over time the lines inside the rad have been known to corrode and start leaking. This would put oil in your coolant. You would be looking for small steel lines going in and out that would trace back to the transmission. Hope this helps.
SOURCE: Oil in expansion (coolant) reservoir Golf 1.4 98
replace the oil cooler first before you change the head gasket ,but normally a 10 year old vehicle often has gasket fatigue ,not made like a good old fashioned copper head gasket ,they rarely went wrong
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