Antifreeze For Antique Cars. Evans manufactures the ONLY line of waterless engine coolants. Also the product may be labelled Safe for Older Cars--meaning 10 years old at most.
Evans Coolant meets ASTM specifications for waterless coolants for Light Duty Service. Brands to be avoided are all Prestone lines and Zerexs G-05 in the Gold container. So when you look inside the radiator of your antique vehicle if you see green chances are your antifreeze is of the IAT formula.
Antifreeze inhibitors eventually break down and the cooling system is then at the mercy of rust scale debris and corrosion.
Also the product may be labelled Safe for Older Cars--meaning 10 years old at most. Coolant Antifreeze manufacturers have quietly moved over to new Organic Acid Technology OAT from the old Inorganic Acid Technology IAT. Many people who own classic cars accept engine overheating as a necessary evil but you dont have to. Unless you want the cooling system of your engine to freeze then you should start paying attention to.