There is de-ionized water, distilled water, demineralized water, hard water, soft water, and on, and on. I learned that distilled water is not good as is hard water. Distilled water will want to dissolve the metal parts and hard water will settle out minerals, kind of like opposite ends of a spectrum. Getting into the chemistry of water is a subject all by itself. The short answer is you should go with soft water but not soft water that was made by adding sodium ions as in a water softener. If the water in your local area is known to be hard the "best" alternative is to use bottled drinking water or pre-mixed anti-freeze. Here in the East the water is generally soft but in some areas with well water the water can be hard. In the south and southwest the water can get very hard. The guy at the local radiator shop can show you what the insides of the radiators look like from the local water and tell you what you should use. David Teitelbaum vin 10757 -- In dmcnews@xxxxxxxxxxxxxxx, "M. P. Olans" <mpolans@xxxx> wrote: > David, > What do you say NOT to use distilled water? > > Matt > VIN 16816 > [moderator snip] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/