Be very careful doing this as modern injection systems sometimes struggle as the lubrication properties of the oil are different to diesel. My understanding is that doing it yourself is no good. You need to buy the proper stuff that has been refined correctly. Someone my dad knows had a go at this and 3 of his businesses fairly new BWM's were knackered by it. You can not just sieve it as many people seen to think. There is a lot of hassle involved in doing it properly (Which is my opinion is the only way) and it is expensive to tool up to do it correctly.
Most manufacturers allow a 5% blend of bio-diesel. The warranty is still valid if you do this. You can buy this or add your own blend.
Jonathan
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