I remember the pitch that the Nalcool sales guy gave us at the truck shop ca. 1970's. He used a voltmeter and read about 1.5 Volts from the rubber mounted radiator to the engine. He poured in the Nalcool and then read 0 Volts between the two. In those days, there were zinc plates in the cooling system that acted as sacrificial metal for corrosion control. The Nalcool took the place of the sacrificial zinc plates by virtually eliminating the corrosion.

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

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