Engine coolant water options...

[Lannister902]

Hi,
My bmw (n55) needs engine coolant, there seems to be differing opinion on the matter, so I'll ask on here!

Will dionised water work as well as distilled water? Or can I just use tap water will the coolant?

Thanks

Edited by Lannister902 on Tuesday 5th March 15:39

[Lannister902]

Haltamer said:

Deionized is my favourite - Usually sold for battery topups or use in Irons, so you can get it in Tesco easily

Distilled is also good.

Avoid tap water or bottled water unless emergency; Mineral content in the engine is best avoided.

I can't seem it find any distilled water unless buying online, deionized water seems to be available from supermarkets...

[Lannister902]

MustangGT said:

I would not be using any sort of water, you will be diluting the antifreeze. Ask a BMW specialist what type of coolant they use and buy some of the same.

It's the genuine BMW coolant, it's recommended to add water to the coolant at 50%-50% coolant to water. It's just the type of water that's in question