Murray brand drive lawn mowers use Briggs and Stratton engines. Manuals for the several models of this organization’s engines used in Murray mowers all call for unleaded gasoline with a minimum octane of 87, although in the event that you live where the altitude is greater than 5,000 feet above sea level, the minimum octane is 85. Using 85 octane gas, even in high altitudes, reduces operation and increases fuel consumption and emissions. An available high-altitude kit may allevieate fuel problems. Unleaded gas which includes up to 10 percent ethanol is also acceptible, both below and above 5,000 feet.
Unlike yard equipment that works with a two-stroke motor, you don’t add any oil to some Murray lawn mower’s gas. According to the engine manual, doing so can void its warranty. Fuel stabilizer, however, is recommended to maintain the fuel from getting gummy as it breaks down, especially when the mower is stored without use for long periods.