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I refilled with 60/40 water/coolant before I pulled a 2000 pound trailer 2100 miles from Orange County to Alabama in the middle of July. Coolant never exceeded 215 F. For reference, coolant routinely reaches 210F at 65mph on the highway with just me in the car.
You don't need water wetter. These cars manage coolant temperature very well.
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'15 F30 335i 8AT Estoril II/Black (12.218 @ 114.94mph)
MHD Stage 2+ 93 / XHP Stage 3 / M-Goodies / K&N Filter / ER CP / CSF IC / NGK 97506 / ER DP / Michelin A/S 3+
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