... 3 easy maintenance and easy installation' 4Full automatic control waste oil boilerModel No.: WOB-10 Features:1.Various fuels are applicable ... , e.g. used engine oil, used vegetable oil, used crankcase oils, used Glycerin, used Hydraulic oil, used synthetic oils, waste machine ... , waste grades #1, #3, #4 heating oils, waste mixed heavy oil etc., as well as regular oils, such as diesel, etc ...