The only kind of protective coating that was done at the factory was the Lower Bodyside Protection option (urethane coating, painted body color), and that was only on the lower sides of the car (below the molding) between the wheel wells, and maybe behind the rear wheels. It was not under the hood or under the car like a normal aftermarket rust proofing was. The factory books say is became standard on all models in '85 but I don't believe that to be true.
Some here might be familiar with that urethane coating, especially on cars from Canada and the Northeast states. There would have been a third buck tag saying "ROAD ABRASION" (usually repeated at least once on that tag) and an "RA" code on the other non-DSO buck tag.
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