CRC Diesel Fuel Therapy works some wonders for some of those issues.... I’m not a big additive fan, but I have several customers that we’ve run the stuff through and they were impressed enough to call back or stop in and thank me.

I run 2cycle oil in my 01 especially when it’s hot and we’re towing. My 01 antique was not designed around the ULSD fuel. Actually got that blessing from Cummins years ago has the extreme heat out here would thin the newer fuels enough to set a P0216 code on the older VP trucks.