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I just don't buy the excuse that the temperature gauges are not accurate. It's easy to say, but I've never seen one that really was. All the gassers I've ever had sat right on the thermostat setpoint regardless of operating conditions. The Mercedes diesel seems to be a completely different beast that varies it temperature depending on load -- mine sits around 80C +/- 5C until I get up to freeway speeds, then it rises, and if I'm cruising up a hill, especially at high altitude, I can get close to 100C.
I also hear the thermal load for a diesel is higher, but I cannot understand how. A diesel is a more efficient engine, and in theory should shed less heat to the radiator as more heat is used doing work -- it has a cooler exhuast and better mileage than a gasser.
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