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I remembered another thing. EASY fix. If, at sometime in the life of your truck, it was filled with plain 'ol water, well that caused rust, cavitation, etc. The soft plugs can be damaged when just water is used. When you drain the water and install coolant, the damage should stop, or be slowed...

I forgot, one more place, between the block and liner, this is a midstop o-ring or heavily cavitated liner/block. Or overheated

OK, so now you know it is from the engine. If there is no oil in the coolant, the oil pressure is greater than coolant pressure, it will be the air compressor, aftercooler, liner, head, block or head gasket. If it were me, i'd drop the pan and pressurize it. Air compressor will be from the...

ELC is the "new" type of antifreeze. Extended Life Coolant. I forget the whole story about it, something to do with not being sweet as to not attract animals. It is very acidic and, if used in early products, like the years of all the green things here on SS, will attack rubber components in...

Check to see what it is first or you will start tearing into things that don't need to be messed with. Do the taste test or use a refractometer

Take the oil filler cap off at the valve cover and have a look, do this carefully so if there are drops of water under the cap, you can test them. Mayo on the bottom side means water/coolant in the oil. I ASSUME you are running antifreeze, so, if you have the mayo under the cap, and have...