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Overheating an engine due to cooling system problems happens very quickly and can easily cause catastrophic damage. Cooling systems are designed for a specific maximum pressurization and boiling point. Changing the pressure release max of the cap is an unnecessary risk. Changing the specified mix of 50/50 coolant is also a risk. I suggest checking the components about every 10,000 miles and a PM interval of 75,000 to 100,000 miles using OE or OEM parts.
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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