The Biodiesel thing is fine if you have a source for the oil, but it can lead to premature engine failure, as it does have more sulfates than regular diesel has. Service stations use a 10% mix to stay within mfgrs recommendations/warranty. The stuff runs really well in my old Caterpillars, but I seem to be always hungry....
Lots to learn for me.
Seems though the Ultra Low Sulfur Diesel nowadays is the one more problematic to older engine due to low sulfur. Older engines depend on it to protect their pumps and injectors from premature wear.
If I read it correctly, biodiesel contains no sulfur and has a very high lubricity factor. These two qualities make it an ideal for older engines and new; here's the article (see section Biodiesel to the Rescue): http://alternativefu...ypes/a/ulsd.htm
I think one of the concerns is that Biodiesel is a good solvent, and that proper fuel line (synthetic) should be used vs rubber.