HPR for late model Mercedes common rail diesels?

[cmac2012]

I've been reading about the issues of B5 vs. B20 for use in the later model diesel engines. I also gather that one of several reasons that Mercedes will not be selling diesels in the US has to do in part with the prevalence of B20 in US pumps. Prevalent might not be the right word, I'm not really sure if it is the dominant bio blend on the market. It's not an issue I've had to worry about so I've not had to look for B5. But I understand that modern Sprinter class rigs have the common rail engines that don't play well with B20.

What I don't know is if HPR is above these issues. Gen 1 biodiesel uses methanol in the brewing/distillation of the stuff. Correct me if I'm wrong but HPR does not. Not sure if that's the only reason that 20%+ gen 1 is a problem.

I did a quick search to see if this question had been addressed before, I suspect it has come up, but I couldn't find it.