My 95 can run up to the 100 mark on a warm evening in Texas. Consider that the engine compartment is pretty tight in there, so heat dissipation is not optimal. IN that regard, I would suspect that the 300SL probably runs a bit cooler...

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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