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You need to be really anal for this to work in the long term. Even though a veggie trip now and then might not hurt too much, you can end up with a hefty bill if you don't heat the veggie stuff enough. In this case, more heat is not too much. You need to get the veggie oil as close the the viscosity of straight diesel as possible, that means a lot of heat. Else you'll end up with oil dilution and eventually sludge like buildup everywhere, even with the best synth oil. You'd be a lot safer with straight biodiesel, but you can't switch back and forth between dino and bio, else swelling (biod) and shrinking (ulsd) pf the seals will cause your pump to leak.
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