Yeah, I read that too. Where I lived in Norway we had the best water possible to find out of the tap, soft, very little minerals, so I have always used tap water. But, I have worked on engines where you can see on the outside of the liners / sleeves that there is a lot of beige chalc or whatever you will call it, and other things too not so good. I have never had any idea why it was like that, but then I read about the water. And here the water is hard, so I will find better water for the car.
