D
Deleted58156
Then you haven't talked to many people. Considering distilled water is like, 50 cents a gallon, I think it's money well spent.
And yes, one coolant change with tap water probably wouldn't do harm if you changed the coolant regularly. But most people's cooling systems are already in crap shape, and that tap water would likely sit in the engine for another 150,000 miles.
....well in b.c. it ain't trust me, its actually quite expensive....but then again to each is own, oh and i have spoken with many shop profs and mechanics seeing as how i worked in a service bay/parts department before....
what you may be forgetting though is that most people aren't to knowledgeable on this topic and not all people know that they should be using distilled water, as its far purer then tap water, though i believe (and this is my belief) that if it were as important as using the correct style of rad fluid, or engine oil then the manufactures would be stating it right on the overflow box or the rad cap itself. (and perhaps not just in the owners manual.)