Does you fan stay on?
I see about 213degF in hot weather80-90sF for the engine and it goes down to 208 in cooler weather 50s.
Trans about 186 in hot weather and down to 180 in cooler.
In cooler weather I was in mountains with a great run for 50 miles and no cars in 3rd gear (revs up) mostly and hard on it mostly. the engine stayed at about 213 and the trans went up to low 190s.
Speed makes a big difference also as in town it is higher and at highway speeds it drops some with better air flow if not to high rpms.
Nice job AMG --and by the way if you have not yet had to chance to do the AMG Academy --it is a must as I just got back from Laguna Seca (amazing track)(one instructor said he had 30,000 laps there ) and what a kick and learning experience. YOU drive them all but the C63 is really good and of course the GTS.
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