Bmw750Li

Asked by Jul 20, 2016 at 08:32 PM about the 2006 BMW 7 Series 750Li

Question type: Maintenance & Repair

Why do you have to use distilled water in ur
coolant? And if you don't use distilled water will it
harm anything

3 Answers

47,855

Not using distilled water is just dumb. Distilled water has no contaminates in it. Perhaps you would be better off buying coolant that is pre-mixed with water 50/50?

12,445

While pure water will work in a pinch IF temperatures never drop below freezing, (a) it can destroy the engine if it does freeze and (b) it doesn't contain the anti-corrosion additives which are common in modern antifreeze mixtures, so it probably isn't as good for your engine as the proper dilution of antifreeze.

22,435

Water contains minerals- when distilled, it leaves these minerals behind- the use of regular water will eventually leave your fancy aluminum radiator coated with mineral deposits-

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