I did not think mine went that high either, went out today, drove the MB, just to provide feedback here.

Outside temperature indicator started at 102, went to 105, maxed out at 106. Did some in-town driving with stop & go and out on the highway stuff, 20 minutes maybe, trust me in this heatwave it was warmed up. Mine never got close to 90 on the engine temperature. About a third of the way up from the 80 mark to the 100 Celcius mark, guess about 87. Took a long time to even get over the 80 mark.

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raMBow

1999 E300DT Obsydian Black Metallic, Heated Full Leather Parchment options, E2, K2, 136,000+, best 36.5 mpg - GP's 12-04 & 11-12 Zero Stuck
2010 Honda Odyssey - The BrideMobile - best 26.5
(2) 2005 Honday Accord- (1 -Corporate 1 - Personal) - 110,000 4-cyl 30mpg
2000 VW Golf GLS TDI, Upsolute Chip (sold to Brother, now 300+k on it) 48.5 mpg like clock work
1987 Honda CRX HF - Sold 87,000 always over 50 mpg Max 67 mpg