All last Summer I ran Bio 100 (100% biodiesel) in my '86 Trooper TD with zero problems. Ran 4 or 5 tanks at least before switching back to dino diesel in the fall. On bio diesel the Trooper ran quieter, produced less smoke and had a bizarre odor from the exhaust. I loved it! Currently I run bio 80 but the next fill up will be with bio 100. There was no difference in power or milage or starting ability.

Steve