Hey Don,
The STP Oil Treatment cans shown are some of the first cans purchased when I started collecting additives last year. They have the cardboard composite bodies on them. Since then I have learned a lot more about the products and their "generations" of cans. To fit in better with the era that I am shooting for I will eventually swap them out with metal cans. The reason I haven't already changed them is because of the relative ease of finding these STP products. I have been concentrating now on the products that are harder to come by...
