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is there a special corrosion inhibitor for cooling system to prevent head gasket on 1997 Cadillac Eldorado

no failure at this time. have 50,000 miles on car & want to prevent head gasket failure.

Asked by for the 1997 Cadillac Eldorado
they sell several but i don't think any work.the alium heads and steel block do not go well together and the dexcool coolant doesn't help much.
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blue devil