During hot summers it will do that. However, the thermostat in my 300 was starting to go bad. It would run at 100 on the nose no matter what, except on the highway. I kept thinking about my injectors (replaced just prior to that problem) or injection timing off raising my combustion temps, but in the end I replaced my thermostat and I'm back at 83 C.

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Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section