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Originally Posted by nckmsn
I've noticed a drop in power in my 1980 300sd with b100. b75-80 takes care of most of the loss. I think that a partially clogged filter will allow the less viscous dino pass through fine when the b100 will slow easier because it is more viscous. you might consider changing your thermostat to a higher temp rating. this will allow your motor to heat the b100 more for moving through the filter, and for burning more of it. I'm not sure how good this is for the motor though.
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The fuel system has a thromstatically controlled heating element - higher engine temps will not have a direct effect on fuel temp.
I also buy my biodiesel at Cropper's in Berlin, they don't have a B20 pump but they do have a dino diesel pump right next to the Biodiesel pump, just pump 2 gallons of B100 for every 8 gallons of dino diesel and you will have B20.
I had the exact same low-power problems on my 2.5 turbo - the problem was the fuel tank strainer screen. The bottom half of the screen was blocked with crud but the upper half of the screen was relatively clear. When I had less than a quarter tank of fuel the car was very sluggish but filling up would immediately result in better performance. I'm guessing this is due to the fact that the fuel level now covers the entire screen leaving more effective area for fuel to seep thru into the collection lines. Cleaning the tank strainer immediately restored full power in my car - unfortunately cleaning the strainer is messy job.
The OM 60X series of engines seems to be very sensitive to delivery pressure - it's pretty easy to plumb in a low pressure gauge into the fuel line after the spin on filter and monitor your fuel system pressure. At idle pressure is typically 6-7 PSI and will increase to about 10-11 PSI at 2K RPM. If you are not seeing these pressures you have a fuel supply problem and your engine will not develop full power.