Learning something new here. I did not drive much, but I always just use regular diesel without additives. Somebody mentioned definitely NOT to use SHELL V-Power diesel (which I use in my private cars) because it cleans too much these old engines.
Additives in diesel are very unknown here, since we automatically have winter and summer diesel that fits all modern (less than 20 year old) engines even big trucks. Never heard that anybody put something extra in the diesel unless it gets extreme cold (below zero Fahrenheit) for weeks, and then its just adding a bit of regular fuel.
Here in the EU we now also have new indicators on our pumps: E10 and B7 for the standard fuels. B7 is the standard diesel with not more than 7% biodiesel. Can be as little as zero, that is just the upper limit. E10 means max 10% ethanol. All cars can drive on that stuff without problem.
So should I put some additive in my 5-ton 1965 multifuel (rebuilt 1973) to help save the pump and other parts on top of the European standard diesel?