1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 65Get this manual
Fuel Requirements .Models 60,65WMLEI 70 65RS, WMLK, WMLY Recommendation See fuel classifications belowSee fuel classifications below
Minimum Octane (R+M)2 "AKI" 87 67 "RON" 90 69
PCE0020
Preferred Fuel: Any regular unleaded, regular leaded or premium unleaded gasoline having the recommended octane rating and not extended with alcohol is the preferred fuelAcceptable Fuel: Any of the above gasolines with up to 10 alcohol by volume: 10 ETHANOL METHANOL with colsolvents The use of premium grade fuels is specifically encouragedMost national brand premium fuels contain detergent and dispersant ingredients advertised to reduce intake valve and fuel injector depositsThese ingredients also remove and prevent carbon buildup on pistons and ringsThese ingredients can extend engine life while maintaining high level of performanceUnacceptable Fuel: Do not use any regular unleaded, regular leaded or premium unleaded gasoline have more than 10 ETHANOL or more the METHANOL even if it contains cosolvents or corrosion inhibitor, regardless of octane ratingOMC products have been designed to operate using the Preferred Fuel or Acceptable Fuel; however, be aware of the following: The boat fuel system may be different regarding use of alcohol fuelsRefer to boat owner's manual Alcohol attracts and holds moisture which may cause corrosion of metallic parts of the fuel system All parts of the fuel system should be inspected frequently and replaced if signs of deterioratjon or fuel leakage are foundInspect at least annually Alcohol extended fuels can cause engine performance problems