Blown head gasket
leak in the water over oil cooler
dont run it this way. You'll kill the engine.
September, 17, 2009 AT 1:24 AM
The most common cause that we've seen for coolant in the oil is from leaking piston liner sleeve o-rings, also the other common cause for coolant in the oil is usually from your oil cooler.
To check for liner o-ring leak causing water in oil we recommend removing oil pan fill cooling sys. With water if low and pressure test cooling sys. At coolant tank with pressure tester and look for coolant leaking down oil pan.