We had a CAT Fact Rep tell us to run lubricity additive and biocide.
This was when the EPA making us change to ULSD.
The EPA official line is it won't affect engines nor will Bio Diesel.
Both have been shown to be official lies.
Cat and others were ordered to not buck EPA policy to public.
When they stripped almost all sulfur out of diesel it took out the lubricity provided by sulfur. The sulfur is also a strong biocide.
I put biocide in our tank when going into storage.
I put no more than gallons of biodiesel in the tank for lubricity capabilites of biodiesel. Bio diesel doesn't like the polymers and rubber, in lift pump seals, and hoses etc of older and even newer diesel engines. Newer engines cope with it better because of changes in materials to cope with it.
I carry Cat lubricity agent, a bit over thirty dollars for a bottle, with us. I have forgotten how many gallons it treats, without looking.
EPA doesn't care about our pocketbooks nor is it familiar with the truth.
The political agenda is their only morality.