Hello. I've done research and have found two diff things. And both are said to be it. Here it is. I'm looking at an 08 copper s, for 2k. There is oil in the coolent, but not coolent in oil. I've read that it's either head gast or the oil filter gast. Both have been the soliotion. He said that it didn't lose power, but over pressurerised and pushed the oil/coolent out of the tank. Would that be the oil filter gast letting oil in and causing to much fluid? I thought like old school if was head gast then it would lose some power when trying to go?? This will b a 2ed work only car to keep miles off my wrangler.
Thanks. Barron.

 

Your best bet is the process of elimination. The easiest one would be the oil cooler gasket. If that doesnt help then try the head gasket and while you there replace the timing chain kit and clean the intake ports.

One other thing someone metioned was a freeze plug in the cyl head. His was loose. Just take a peak. Keep us posted.

 

I'd do a compression or leak-down test too --- looking for large variations (1 or 2 bad cylinders), not an absolute number range.

 

I had a similar problem in my wife's X3, and it was the oil cooler gasket.