Hello I had a crack in my head gasket that was leaking antifreeze into my #3 piston cylinder fouling the plug causing loss of coolant and a check engine light. I was very angry about this because I had just replace the engine because of rod knock caused by oil sludge. After doing extensive research about this issue I found out there are several things that contribute to this problem. First is that the Magnum Series engines coolant system is not designed efficiently. So it has hot spots in the cooling system. Which happen to be near oil passages that cause the oil to boil and burn in the passages. Second the head gaskets are flimsy and develop cracks in them that very slowly leak coolant into your oil. So slowly it is hard to detect unless you have your exhaust gases checked by a professional or go through the process of elimination to figure it out. The third issue is the Plenum gasket can and do fail causing excess of air into the engine that causes the oil to dry up and sludge up inside the engine. Knowing all these things when I developed a check engine light. I went through the process of elimination. Ending with pulling the spark plug for the #3 cylinder. Discovering coolant on plug. Face palming myself. I was so angry I didn't touch the truck for three days. On the fourth day I sealed the whole engine block with Bar's Leak Intake Manifold and Block Seal Copper Liquid Glass Formula. It worked and stopped all coolant leaks in the engine. Switch to TRUE full synthetic engine oil to stop and or slow down sludge development in engine. Has run like a charm ever sense with no signs of symptoms of leaking coolant or oil sludge at all. I hope someone finds this information of help. Peace