The engine was clean of all carbon buildup.

Earlier in the day there were a couple of long hills. 10 to 12 miles long. Warning signs read "switch off air-conditioning to avoid over heating" l went up at 75 mph, air on and yes the temperature gauge rose to within 2 needle widths of the 100 mark. My understanding is that the electric fans do not come on until the temperature reaches 100.

I didn't but I should have done a WOT at the top.

Also the engine temperature dropped to 1 needle width below normal 80 operating temperature on the way down as the engine slowed the car.

Fantastic trip 8,254 miles, did not add oil but am about 3/4 down now.

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250, Dec 2024 145,000 miles