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I've been making homemade biodiesel for 14 years for my 2004 VW Jetta, which is happy to burn 100% biodiesel. I know that I can't do this with a modern Colorado Duramax. What percentage can I burn without causing problems?
 

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I've been making homemade biodiesel for 14 years for my 2004 VW Jetta, which is happy to burn 100% biodiesel. I know that I can't do this with a modern Colorado Duramax. What percentage can I burn without causing problems?
Fuel
Fuel for Diesel Engines
The selection of a high quality fuel
is important for maintaining optimum
performance. Do not use diesel fuel
with more than 15 ppm sulfur
content. Do not use a diesel blend
containing more than 20% biodiesel
by volume. Both diesel and
biodiesel blends must meet all the
requirements as defined in the most
current versions of the local fuel
standards.
 

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Man, it's been hard to find bio of any ratio around here for years. Finally found some B5 at one of the new Maverick stations in town.

Years ago I had a GMC Sierra Duramax as the biodiesel market was growing. Tried it for the first time and sure enough, had to get the fuel filter changed out after the bio cleaned out the gunk accumulated from years of running dino diesel.
 

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Just be aware, like ethanol blend, it's splash mixed. That means it can vary wildly. B5 is anywhere up to 5% and B20 is anywhere between 6% and 20%.
 
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