I have oil in my coolant jug. Not good, huh? It's a '99 Ecotec 2.0SE. Do they go porous easy? Or is it more likely just the head gasket? Also, cranking compression pressure is WAY off the scale at like 1500kPa each cylinder! That can't be right for a 9.4:1 "SE" engine. This is a turbo ecotec that made 320hp recently on 1Bar boost, though it has never run quite right. It has 66,000 miles and new timing belt, tensioners, etc. What the h*ll?