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While not the same engine.....
Years ago I had a W126 300SD that had the same symptoms. It would gradually rise in temp at freeway speeds. Otherwise ran fine.
Luckily, I also had at the time a mint W123 300D turbo, which coincidentally, used the same radiator.
Swapped out the radiator from the no problem W123 into the W126 300SD, and the problem went away. Ordered a new radiator for the W123 300D and all was right with the world again.
Jim
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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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