Picked up a car recently that had been sitting for a couple months. Coolant tank was empty, battery was dead and oil looked dirty. Got it home, charged it, drained the oil and the first thing that came out was coolant, followed by oil. Neither were mixed, it looked as it would if you poured oil and coolant into a container and left them to separate. Wasn’t the typical milky look. Put in new oil, had to add maybe a quart of coolant, and it started right up. Let it get up to temp, nothing out of the ordinary, didn’t warm up quickly, not misfiring, compression was 160-170 across the board. Coolant color is normal, Ill be draining the oil again tonight to see if it mixed again but any ideas on the culprit? I am doubting a head gasket issue considering good compression, no misfires, not overheating etc. Anyone familiar with the oil cooler, there isn’t a gasket in it that could fail and allow them to mix is there? I think the cooler it self would have to fail completely.
