It could be a poor batch of fuel perhaps? On both my 300SD and my 2002 VW I notice no difference at all in performance between B100 and dino, but both engines sound quieter and smoother on B100.

You've checked that your inline fuel filter isn't plugged? Mine got pretty black, pretty quick after running Bio, it seems to shift the gunk from the tank. Wouldn't really explain why your performance instantly appears better on Dino though.

Kevin

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'85 300SD