My '91 350SDL w/ 126Kmiles is running hot--radiator, water pump, and thermostat replaced in 6/04. Temp gage reads as follows after warming up with ambient temperature in the mid-90's:
20 -50 mph = 105C/200F
60 mph = 110C/208F
75 mph = 115C/216F
Otherwise, engine is strong and smooth running with no unusual oil usage.