Newbie here, I have an 01 acura mdx with a 3.5 AWD. I bought the car for 400 and it is mixing coolant with oil. I did a compression test and it read on 3 cylinders 180ish and on the other three it read 220. I took the heads off and had them checked at a machine shop and they were not cracked. Also the head gaskets didnt have any burn spots in them. The previous owner said it had over heated due to a failed old water pump. I also looked at the transmission lines because from what I hear the mdx is notorious for tranny lines leaking in radiator. That was all good. Could the heads maybe warped that bad from the over heating? What else could be the issue? Any help would be appreciated. Thank you in advance.