Average operating temps are 85-87C on the 300E, and 90C for the 400E...obviously circulation and underhood area contributes to this...

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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