I found the manual for this model weed eater, according to the manual the mixture. And I quote 'This engine is certified to operate on unleaded gasoline. Before operation, gasoline must be mixed with a good quality synthetic 2-cycle air cooled engine oil designed to be mixed at a Ratio of 40:1.' And I quote once more from the manual 'Helpful Tip. Sony Vaio Pcg 7121m Drivers For Windows 7. To obtain correct oil mix ration, pour 3.2 ounces of 2 cycle synthetic oil into one gallon of fresh gas.' Hope that helps, If you like I can send the manual via email if you need it.:) happy weed thrashing Aug 12, 2011 .

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Feb 04, 2014 Repairing a Weed Eater edger? This video demonstrates the proper and safe way to disassemble an edger.