I have a 2000 gmc Sierra with 173k miles. Automatic with a 5.3. I have coolant mixing in woth my oil but the truck hasn't over heated on m . Has ran warm in the past but didnt over heat past 213. No smoke coming from the tail pipe. No coolant in any of the sparkplug holes and I preformed a block test twice and the liquid didnt turn yellow. Oil pressure is low but that's definitely from the coolant mixing i . Truck dosnt run warm but the coolant still disappears without any signs of outside leaks. Foes anyone have any idea on what this can be? I'm not sure if it's my head gasket or not
If you have coolant mixing into the oil then you either have a blown head gasket or a cracked cylinder head. Low oil pressure means that your engine's bearings have been damaged as a result.
