All you need is a mixture of 50/50 anti-freeze and water. The water should be "soft" or if not then distilled. The anti-freeze should be a national brand and say safe for aluminum. Refer to a following post #17299 for an explanation of bleeding the cooling system of air. Fill the header bottle to the full-hot mark. If you need to keep adding coolant it means there is a leak which is BAD NEWS. The cooling system must be kept leak-free or you will overheat the motor with disasterous consequences! David Teitelbaum vin 10757 -- In dmcnews@xxxx, "K Creason" <dmc4687@xxxx> wrote: > My overflow bottle is low (dry!). > I obviously MUST add something immediately. Can it just be tap water? Soft > tap water or hard water? Distilled? > Do I need to add special chemicals because of the aluminum engine like the > Northstar engine requires? (so I hear) > > I probably should do a flush since the most recent one may have been 97 when > a previous owner had a lot of work done at Houston. So in the mean time... > water? > > --------- > I read this somewhere: > "most experts agree that the end of the world will come by accident, most > likely. That's where we come in; we're Computer Experts, we make accidents."