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This summer I'm planning to bring SRL 00099 out of 30+ year slumber.</div>
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With cast iron block, aluminum head and copper/brass radiator , What current (OAT, HOAT, POAT, IAT, or Si-OAT)formula antifreeze would be best for compatibility?</div>
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P.S. Back in the day the choice was easy.. One type each of identical either Zerex or Prestone 🙂. (Or even just water with a can of corrosion inhibitor)</div>
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Jerry Krakauer</div>
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