My car runs around 90-95 deg C in normal driving and 95-100 with the AC running. This does seem a bit high to me, although I did have my thermostat changed a while back. Prior to this, it took an 8 mile drive to get it to 80; it would warm up only to 60 degrees after a few miles. I guess I should be happy that I'm getting warmed up fully; mileage at 60 deg C was about 5 mpg worse than normal. My '77 300D held 80 deg. C constantly unless the AC was on.

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Robert W. Roe
1984 300SD 173K mi