Do your part and burn a B5 blend as MB suggests is acceptable.
As little as B2 provide lots of additional lubrication although it should not be needed as the engine was designed to run on ULSD.
If you are still interested in the Bio question, join a European forum and read members exppiriences there. THey have had your engine for a couple of years now and so have more expirience with it.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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