Mine runs with those temps during the dog days of Texas summers...even flat out on the highways in the evenings.

But right now, temps are cooler and I'm not seeing the high side of 90 in the SL just yet.

I believe you are running okay for your ambient temps.

BTW, when's the last time you did a coolant flush?

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car