I have a 84 190E 2.3, just acquired the car. 73,418 miles. I did a compression test numbers were good and even. Engine does not get any warmer than 80c temp wise. Well today I noticed the oil looked milky. I drained the oil and it was very thin and milky. The car has sat for a long time. What could have caused this? Bad head gasket? Coolant is fine by the way.