Why do you have to use distilled water in ur
coolant? And if you don't use distilled water will it
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?
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.
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-
Looking for a Used 7 Series in your area?
CarGurus has 5,545 nationwide 7 Series listings starting at $1,995.
Search BMW 7 Series Questions
BMW 7 Series Experts