Green antifreeze or coolant as some call it.

Bills65Dart said

I have looked at the Prestone site, and the only thing I find there is a brand called Prime, with low silicate formulation. I don't know if that is good or bad for my Slant Six.

Bill

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No sense to over engineer this. Go to Wal Mart and pick up gallon of their generic brand. It will be fine. Not rocket science! The non 50/50 mix is best mixed with distilled water with a 50/50 mix. Buy the premixed and you are paying a preimum for convenience and water. Your choice.