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      04-29-2016, 08:31 PM   #6
Killerfish2012
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Drives: E90 335I, E92 M3
Join Date: Feb 2012
Location: Midwest

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Quote:
Originally Posted by eyanez1230 View Post
Hey all,

My car needed some coolant to be topped off so I mixed some OEM BMW Blue coolant with regular tap water since I did not have distilled water. In total I used about 1 quart to top off. Within that 1 quarter was 50% water, 50% coolant.

Should I be worried? I don't plan on doing a coolant flush to get rid of the tap water, but want to get everyone's input. I'm sure the car will evaporate some of this and I'll need to top it off again sometime in the near future, and that time I will use distilled water, but would appreciate some input.

Thanks!
Will probably not do any harm, but don't make it a habit. Distilled water is so cheap at the grocery store, that it makes no sense not to go get some.
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