The document introduces a waste oil reverse vending machine that rewards users for recycling used cooking oil. The machine measures the oil's content and dispenses rewards like money or coupons. Licensed companies then collect the oil for conversion to biodiesel fuel. Various models are offered that dispense different rewards. The machines help reduce environmental pollution from oil poured down drains. Municipalities and biodiesel producers can install the machines to obtain raw material for fuel while generating income from oil and PET bottle sales or advertisements.