The manual says normal operating temperature is 80 degrees C.

But mine is usually 85~90 degrees C.

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.

Mine runs at 80 - 85. It reachs 90 - 95 on a hot day in traffic.

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DR
1992 300D 2.5T 351 000 km

between 80 -90 at cruise most days
At 100 with A/C on in hot weather

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1982 300SD (214 k, excellent shape) kidmobile running mostly biodiesel, gets 31 mpg hwy with 2.82 rear from a euro 500SEL



1976 115 body 240D 4-speed (traded for Jeep parts) - Engine lives on in my CJ7