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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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Old 06-06-2012, 11:54 AM
akwagon akwagon is offline
Location: AK
Join Date: Mar 2012
Posts: 20
Mein Auto: X5 Diesel
B20 bio diesel???

I know bio diesel has been discussed many times. Reading articles it seems it's superior to traditional diesel. But the problem lies in the quality control of the manufacture of it and how you could be getting a great product or crappy one.
A station close to me is selling B20. I know BMW suggests a max of B7. If I fill up a third of the tank with B20 every few fill ups should I be ok? It's the same price as the normal diesel and if it's true pure high quality bio diesel the x5 should like it.
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Old 06-06-2012, 07:02 PM
Penguin Penguin is offline
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Location: Illinois
Join Date: Aug 2003
Posts: 1,924
Mein Auto: Z4 and X5 Diesel
Remember that in many states up to B5 diesel doesn't have to be posted, so you might be mixing 1/3 B20 with 2/3 B5, yielding equivalent B10.

I would not expect it would cause you any problems, but I don't really see the benefit of not following the BMW recommendation. I know biodiesel is suppose to have better lubricity, leading to longer life of some fuel system components, but I rather doubt that doing a third of a tank every few fill-ups would make a noticeable difference for the extra trouble.
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