Found this PDF while searching around:
http://www.ebb-eu.org/studiesreports...s%20FRANCE.pdf
It's from a French cooperative company trying out a 50% RME blend in their trucks and cars over a long time.
The interesting part is the cars have earlier versions of PSA's 2.0L HDi engines, with DPF and 20.000km oil swaps.
Piwoslaw and I are running the smaller 1.6 HDi versions of these engines - same technology though.
They seem to have had no fuel related problems during the testing, though oil dilution needs to be monitored.
The CoOp is now running B30.