Things may have changed in the last forty years. When I worked in the truck shop right after the Army, our radiator shop vendor told me that radiators that had been containing Zerex for any length of time looked like a lawn sprinkler when tested after the vat process.

That was forty years ago, and lots of things have changed. Radiator materials have changed and maybe even Zerex has changed, but since the radiator guy told me that I've always used any anti freeze besides Zerex.

My $0.02,

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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