Driving back from picking up my sailboat today, the temp gauge started climbing. It's never hit 210 before. Got to to 220, then dropped down and then swung up and down. Low coolant light came on. Stopped and looked at coolant reservoir. It was empty. It was at a normal level about 2 or 3 weeks ago when I checked it. Put in about a gallon and half of coolant and released some pressure on the cap so it would suck it back in. Temperatures went back to normal for rest of drive home. There's been no evidence of any coolant leaks and top hose was not hard. But I just pulled the dipstick. I did an oil change less than 100 miles ago. I'm attaching pictures. There are water droplets high on the stic, there's sludge on the stick above the check indicators, level reads high and there are little bubbles in the oil at the bottom of the stick. Never any sludge or droplets on the dipstick in the past. I think it's done for.

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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