All engines are designed to use unleaded fuel only. Unleaded fuel must be used for proper emission control system operation. Its use will also minimize spark fouling and extend engine oil life. Using leaded fuel can damage the emission warranty coverage. The fuel should meet specification ASTM D4814 for the U.S. or CGSB 3.5 M93 for Canada. All engines are designed to use unleaded fuel with a minimum U(R+M)/2e, pump, octane number of 87, where R=research octane number, and M=motor octane number.

You may use fuel containing ethanol, ethyl alcohol, or grain alcohol providing that there is no more than 10 percent ethyl alcohol by volume.

Do not use fuels containing methanol. Methanol can corrode metal parts and cause damage to plastic and rubber parts in the fuel system.

You may use fuel containing methyl tertiary-butyl ether (MTBE) providing there is no more than 15 percent MTBE by volume.