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I used to have an '88 caddy CDV, 4.5L.. Factory required the use of those 'Bown Tabs' at coolant change... I was told that they were a corrosion inhibitor for the alum. heads... Always used them with no probs... Other than it made the coolant look a putrid brown color...

Yes, Viginia.... There is a brown coolant! Does it come in a bottle? no... For a car I no longer have - '88 Caddy Coupe de Ville 4.5L... Alum. heads... GM factory instructions require that a factory additive, in the form of BROWN pellets, MUST be added after flushing the radiator and adding...