After I did a temporary fix with water glass on the head gasket leak on the 500-something cubic inch GMC Ed Pruss had problems with on his way to Denver, there was coolant in the oil. I did an oil change, removed the filter cartridge, and added a gallon of Mineral spirits to the crankcase. It did a very good job of removing the milky contamination after running the mixture for 30 minutes or so at a fast idle. Just don't drive the vehicle, or put any other load on the bearings. Diluted oil isn't a good lubricant!
Jerry
