Sprinter vans offer an interesting BD challenge, so I've been told... (I was going to buy a fleet to rent out)
Apparently they have a fuel chiller for the common-rail efficiency... (this of course sends chills up the spine of a BD person), so...
Dr, Dan of http://www.fuelwerks.com/ ...
Has been using a pre-heated Racor filter on the Sprinter's, as well as routing the lines closer to exhaust for additional heat. This has proven fine in the PNW climate. (might be too much heat in TX or AZ.)
Personally if I was running BD in an expensive vehicle I would be sure to have a Racor prefilter (BEFORE factory filter) + a fuel pressure gauge (pre-injection pump). The Racor filters have a translucent bowl to indicate what kind of stuff you are feeding your engine, and to indicate the presence of water. + the filter elements are CHEAP. Keeping tabs on your fuel pressure is critical to the health of your VERY expensive Injection pump. You might want to add a 'lift' pump to assure pressure remains adequate.
Sprinter would run fine on B100 as long as it was good stuff, soy feedstock is questionable, (Europe is buying most of the Canola BD) so I would stick with B20 below 40F
janb