Be careful with high bio content fuels, it can be unhealthy for engines. It causes problems with injectors coking and doubles the rate of lube oil oxidation (and that's on B80). I would advise frequent oil changes, don't try to push it past 5000 miles.
We stay with lower Bio rates - B99 doesn't run as well in the cold, it can "gel" up. On the other hand we take care of our Benz. B99 won't hurt it. We have a mechanic that only works on Benz's and his specialty is diesels. Bio run diesel cars are very popular out here. The majority of diesels can handle B99 that is made well - the fear is well, inferior fuel and that a certain number of trucks don't like the Bio's.
One big issue you do have to look out for is when you go to B99 is your fuel filter will get mucked up fast. We had to change ours out even with B20 after a month or so. Now it is great. Dino diesel is not so hot for diesels - it doesn't do the lubrication it used to be able to! A little bio in it is nearly always good.
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