I changed my car's coolant last weekend and used distilled water with the anti freeze.Definately better to use that than tap water since tap water has alot of additives and impurities in it which can eat away at the engine over time. I've never used an additive in my car and don't think it is necessary as long as you stick with a good name brand coolant.In Australia a couple of years ago they tested some cheap brands of coolant and found they were just made of water with green dye in it! I also think coolant should be changed more frequently than 3-4 years.I change mine every 2 years. More crucial though is to get the 50/50 mix of anti freeze/anti corrosion and water correct. Andrew VIN 2883 Sydney,Aus. --- Rod Dillman <rhdillman@xxxxxxxxx> wrote: > When flushing a cooling system should the new > coolant be mixed with tap water or distilled water > or does it really matter? Several years ago I had a > head gasket failure on an aluminium block Cadillac > engine and the service manager told me that if I > had added GM Cooling System Seal Tabs(Part No. > 3634621-a $4 part) with an engine flush every 3 or 4 > years it would likely have eliminated a $1500 head > gasket repair. Since the DeLorean engine block is > aluminium should a similiar additive be used in it? > Your thoughts will be appreciated. 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/