I have been running B100 in my 87 300SDL for a couple of months now, starting off with some mixing of BD with DinoDiesel. I've been noticing that the car had no pickup - once it got up to speed it ran really smoothly, but it had no power going uphill or when I tried to pass. I had chalked it up to fuel filters clogged or such and planned to check it out.

Well, the other morning I didn't have time to lug the 5 gallon containers of biodiesel to pour in, so I got regular diesel at the pump. I saw a nearly immediate improvement in performance. It is VERY noticeable that my car has much better pickup with dino diesel. I had heard that, to run B100, one should probably tune the IP, but I didn't have this issue with the 82 SD. Any ideas on why the incredible dropoff in performance?

I'd love to run biodiesel, but sheesh....

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1987 300SDL 265,000 mi.
1982 300SD 325,000 mi. (and holding)
1956 Packard Clipper 150,000 mi.