Sorry if I didn't make my initial post clearer, I realize that Ultra low sulfur diesel is the fuel of choice for the Sprinter and not biodiesel, MB specifies that if biodiesel is used, however, that the maximum mixture is 5% or B5, any higher they claim will cause severe engine damage. In some areas of the country, as I stated previously owners have not been able to locate ULSD or even B5 but fuel pumps labeled "Biodiesel B5-B20". It seems more common in the Midwest or areas where there is a strong soybean lobby, although I did read of someone having trouble on I-95 in Virginia.
If you Google Sprinter dealerships in Minnesota you will see that they are still selling them, so I agree that it would be very interesting to hear from someone in that area.
For the record Minn. plans on switching back to B5 for the colder months of the year, have also read that in 2015 they are upping the mixture even higher.
Bob