I run WVO.
That's Waste Vegetable Oil.
I have a 1985 Mercedes 190D that runs pure WVO. It has over 800K miles on it. The lubricity of the vegetable oil seems to keep it happy.
I have a 2005 Dodge Cummins 3500 that runs between 5-45% WVO and it seems happy at 250K miles.
Yes, both vehicles have fuel systems I have engineered for their particular designs but both seem to run better with the higher lubricity WVO as fuel or fuel additive.
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