Best of both worlds: Run straight or high percentage biodiesel, purchased from a pump at a legitimate seller (read: fuel meets ASTM specs for commercial biodiesel).

Biodiesel WILL clean out your fuel system from stem to stern, so have plenty of spare fuel filters on hand and the tools to change them anywhere (wouldn't be a bad idea to have some #2 diesel in a small container to fill the big filter when you change that).

Biodiesel will also provide lubricity, if that is your concern. Not my concern, I use pump #2 ULSD exclusively, have for years, no issues that I can detect...

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC