I found the manual here: http://www.instructionsheets.com/mfg/h/homelite/pdfs/homelite_ut43100.htm You may need to place w/print types (pdf etc) my first try gave me a lopsided shrunken version I couldn't straighten. To the person, how much oil. Look on the side, there is a transparent window that lets you see the oil level. Stop when it overflows if you're bifocular like me, hehe.