Ok I did a search on this but didnt get a good answer so here goes. I just recently had my car tested because my CEL came on and one of the codes was something about the coolant I think its 125, but he checked my overfill tank and it had oil in it and said my head gasket was probably gone. But if your head gasket is gone wouldnt there be coolant in the oil? There is no coolant in my oil and my car never overheats or even looks like it will overheat. I also saw that it could be the oil cooler but I dont know how to check it. I mean what could it be? Please help.