Quote Originally Posted by Jmac View Post
What the problem with mixing the coolant with water?????? Clearly it tells you to use water, yes plain ole water, have done for that last 17yrs. Now if you were topping up your battery with just water then i would have something to say, it really does have to be demineralised, obviously as there is metals in the water. So i wouldnt bag your man if that is what he uses.
Jmac
I think it depends what part of Australia you are in. Some of the water has a very high mineral content which can cause a build-up (calcium?). Possibly can also have an effect if there is a stray current problem.

I always used demineralised water in the Subaru