The use of water processed by distillation is specifically not recommended and this recommendation I have seen from a number of crediable sources. Some say to use simply (and I would assume sediment filtered at the least) what comes out of the tap. What confuses is that 'distilled water' is used in a lot of literature. I think that the makeup of local tap water in a lot of areas, even when sediment filtered, can be so poor that it definately should not be used in an automotive cooling system. Reference here would be the plumbing industry that is moving away from copper pipe in favor of plastic pipe for gas and water services (new technology stuff, not the stuff that generated all the lawsuits years ago). I have seen enough published from sources very close to cooling system technology that I use only water processed through an on site reverse osmosis system. Before the on site unit, we used water from a supermarket RO dispenser. This has been what I have used for some 30 years+ now with good results. Coolant does need to be changed. Extended life coolants are generally not recommended for systems with soldered copper parts BTW. Warren Anderson Sedona, AZ Hi Gerald, I too have read not to use distilled water. As I remember, the reason given was that since it has no minerals in it, it wants to leach minerals from it's surroundings. In the case of one's radiator, that would be lead solder and other softer metals. That may be where solder bloom comes from. The article recommended tap water or bottled drinking water I believe. Don't know if it is true or not, but I never used distilled water and never had a problem, but then we always had good tasting drinking water. Maybe some of that West Texas water might not be the best. :-P Bill Huff At 2/11/200810:00 AM, GERALD OLSON wrote: >New subject for the group. Somewhere in my travels >I've heard ah strange rumor that distilled water in >the 50%-50% coolant mix is undesirable and I'm not >sure why! What's ah poor country boy tah do when >living with well 'n septic? Once it goes thru' the >softener, It can't be too desirable. Am I splitting >hairs here? False rumor? Ice Fishin' for comments in >Blue Lips, Michigan, Jerry > > [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/