We tested this beautiful waste (used) oil burner (furnace) with the widest variety of fuels in the industry: Vegetable Oil, Grade #2 Oil, Used Crankcase Oils, Transmission & Hydraulic Oils, Crankcase Oil, 90 Weight Gear Box Oil, 175 Weight Heat Transfer Oil, Mineral Spirits Solvent, Machine Shop Cutting Oil. It even burns Synthetic Oils, Commercial & Military Jet Fuels, and Grades #1, #3, #4 Heating Oils! This waste oil burner is highly adjustable - it has variable output rate. Knowing how simple and at the same time efficient and reliable this waste (used) oil burner (furnace) is people start calling it "The AK-47 of the waste oil burners world!" So will it burn it? Many claim they can but can they prove it?