I run bio and reg diesel interchangeably all the time, there's no difference at all in the way my 240d (girlfriends 300cd) or 300SDL runs.... I would just buy it and use it, if its not running up to your standards cut it 50/50 with reg diesel from the fueling station. It'll work and if it doesnt then just up the amount of reg diesel you put into the mixture until it does.....