Onur probably has more insight...but over 20 years ago hexavalent chromium and cadmium had to be eliminated from car parts. (The good stuff as far as corrosion protection goes - but toxic.) At the same time paint type coatings got better. I wonder at the vintage of the parts with the TEQ logo.
Generally speaking under the hood under the car you see less plating these days and more stainless steel and paint. Zinc with chromate treatment is still ok for now. But inferior in performance and likely going away some time.
Generally speaking under the hood under the car you see less plating these days and more stainless steel and paint. Zinc with chromate treatment is still ok for now. But inferior in performance and likely going away some time.