You didn't mention the make/model/year, but I can tell you that 80C-90C on the highway and 100C at idle is not at all unusual here in the U. S. in 100F temps. If you're running no hotter than 100C at idle in 110F-115F, you're ok.
100C is 212F. That's not unusual for a pressurized system running a 50/50 mixture.
1991 300-SEL - Model 126
M103 - SOHC
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