I use the green presto antifreeze and add 2 pints of and additive made by detroit desiel which the guy I get it sereviced gives. I don't know the name of it but I will get tomorrow and mention it on the site.
I do know that if you don't add it you could ruin your engine. I don't what the rest of you are using but I'm sure there other options than what I do.
I mentioned the other day that I change mine every year because I want it clean as a whistle.
Wally
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