anti freeze type

[leegreen]

If the anode in a rad cap is getting eaten away there is a problem that needs fixing, most likely poor antifreeze condition and a ungrounded portion of the cooling system such that the coolant completes a circuit. If not fixed that dissolved material is being deposited somewhere else in the cooling system.

Lots of automotive engines mix iron blocks, aluminum heads, water pumps and rads and all those components are grounded together. I've never seen an anode except in marine or other raw water cooled systems where the entire engine acts as an anode connected to the ocean/lake and the component that gives up ions most easily suffers.

That 'article' is an advertisement selling radiator caps, likely using a water neck off some boat engine to create fear.