Actually I was excited about it, if someone used waste oil further, but was taught here in the forum of a better one. Therefore seriously my question, whether you can burn waste oil environmentally-friendly, because obviously my boss does this in times of increased energy prices. Isn’t that stupid, because after all, he gets the stuff free of oil change, and if you can burn it environmentally-friendly, why not use it. Maybe there are filters or sieves. e