Antifreeze should be mixed to the manufacturer's recommendations (usually 50/50 for mazimum cold weather protection). Straight antifreeze does not transfer heat as well as a mixture of antifreeze and water. Do not use tap water. You should used distilled (not spring) water available at any grocery store. An easy way to measure your mixture is to fill half of an empty gallon milk jug with distilled water, then fill the jug with antifreeze - Presto(ne)! a 50/50 mix. You now have two half-filled jugs to work with and a gallon of mixed coolant. Mike -----Original Message----- From: Michael Pike [mailto:iqintermedia@xxxx] Here is my question - antifreeze says 70/30 mix maximum...