On the other hand, biodiesel can be more expensive, depending on the amount you produce, what you get from it and the comparison with oil or new petrol. And unlike SVO, it requires treatment. (The purpose of this tutorial). But the community of biodiesel producers that is continuously expanding, doesn't seem too concerned about the matter - they do their weekly or monthly produce and become familiar with the process quite quickly. Many have been doing so for many years.
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