Originally Posted by
Kiltrash
Both used to handling volatile fuel and their vehicles easily cleaned out for Diesel or Unleaded...
I don't think this is possible, it may have changed but additive blending was always done at the point of delivery. A civvy bowser had the main fuel tank and smaller tanks containing the additives. That is why you would see the same tanker at a supermarket and then , soon after, at a regular station. He would pump basic fuel at the supermarket and then blend the additives, detergents etc. when he got to the big name station.