I'm not guessing about a couple of things. Coolant level went down. Crankcase level went up. Changed the oil a week ago and checked it twice since then. Not much doubt about that. It was just a hair over full. Not it's a good inch or more over full and oil is thin and runny, not like the way Rotella Synthetic usually behaves--it kinda sticks to surfaces. Not much doubt about loss of coolant. Was planning a 4k trip next week so checked coolant reservoir last week also. It was just right. It was dry today.

These engines are known for cracking heads, blowing headgaskets and cracking blocks. I doubt that much coolant could have gone thru the combustion chambers without producing a lot of white smoke. No white smoke. Perhaps there is a way of coolant getting into the oil without cracking the block.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13