Hi I have an Mk5 escort that was recently turboed with a FRST Engine. The head was skimmed and a new ford head gasket and head bolts used. After a month of driving I found oil (not cream) in the expansion tank but no water in the oil. The car is not overheating and I have done a compression test all on 150. Some of the things I can think of are maybe the ford oil cooler has broken and is letting the oil mix with the water. Or a small crack in the block?
What can be the problem plz help!

Thanks Ollie