I've been running b99 for almost 2 yrs (b50 for a few months in winter), at least 15K in my 6.0l w/o any problems related to the biodiesel.
2006 F250 6.0L Amarillo Powermax turbo, ARP studs, IDP RR, 4" Banks exhaust - turbo back with Cat and Banks muffler, Banks intercooler, CAT ELC, Dfuser coolant filter, Racor CCV4500, Hi Idle mod, harpooned tank, some big horns, Edge CTS, Isspro Fuel pressure and SCT X3 Matt (gearheads) SRL++ for powermax, DC Power XP270 alt
It might be semantics. But if not, the biodiesel doesn't go through the turbocharger anyway so it wouldn't have any effect on the turbo itself. Being that you have an IDI however, there will be a few fuel lines you will eventually need to replace with Viton lines. The rubber lines will last through several tankfuls or more of biodiesel before they start to sweat, swell up,and soften.
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