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Raw or refined vegetable oil, or recycled greases that have not been processed into
biodiesel, are not biodiesel and should be avoided. Research shows that vegetable oil
or greases used in CI engines at levels as low as 10% to 20%, can cause long-term engine
deposits, ring sticking, lube oil gelling, and other maintenance problems and can reduce
engine life. These problems are caused mostly by the greater viscosity, or thickness, of
the raw oils (around 40 mm 2 /s) compared to that of the diesel fuel for which the engines
and injectors were designed (between 1.3 and 4.1 mm 2 /s). To avoid viscosity-related
problems, vegetable oils and other feedstocks are converted into biodiesel. Through the
process of converting vegetable oil or greases to biodiesel, we reduce viscosity of the fuel
to values similar to conventional diesel fuel ( biodiesel values are typically between 4 and
5 mm 2 /s).
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