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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1578071" data-attributes="member: 29141">You want a little bit of coolant due to its detergents and whatnot, prevents corrosion. Otherwise with straight water you have to be changing it at least once per year or maybe more depending on how aggressively the car is driven. Maybe buy a refractometer and test it periodically.I've run 50/50 with WW for over a decade, never an issue. Just my experience. Very aggressive daily driving (autobahns and country roads) with a minimum two-year flushing. Temps usually cycle between 199 - 215, maybe the offhand 220 during summer's worst days.FWIW these OEM fans (or a truly decent aftermarket) should be pulling enough air out of the radiator to keep the system from boiling over, especially with these nice TIG welded all-aluminum cores (aftermarket). Keep in mind during high-heat days in summer, the coolant system once it reaches the higher end of its temp cycle may linger up there for longer than normal and take longer for temps to fall to the bottom of the range. This is also normal.</blockquote>