MOST ALL of the OTC diesel fuel treatments are formulated mostly of........................................... diesel fuel!
Can't find the study right now but it found 2% biodiesel the best lubrication additive for today's ULSD.
Personally I think the the whole "ULSD will destroy your IP" is a rumor. Have the mainshafts been snapping after seizing up from lack of ULSD lubricity?
My own observations show that what kills these IPs are:
1. Water in fuel, or bad BD or bad WVO.
2. Sitting too long in bad conditions.
3. Run with a clogged fuel filter (vane pump disintegrates, sending shrapnel thruout the rest of the IP).
4. Rebuilder (or tinkerer) error.