I have some Lucas fuel additive that I use ... often I buy grocery store 10-30 motor oil @$1.25/qt or less and add 5 oz per 10 gals or so of fuel.

I read many post of folks who don't believe extra lubricity is necessary, but I have strong memories of my parents trying to get home to NC from my sister's in Phila when the Feds did the first big change to diesel fuel, and having the engine run a couple of hours before the IP locked up. There were tractor-trailers all over the place, too. They finished the trip on the cab of a flatbed tow-truvk, with the car on the back. They started adding ATF with every tank & had no more troubles ..... and the IP survived and is still running, as far as I know, with no signs of distress. So I add a lubricity additive.