1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Manual, Page 60Get this manual
Fuel Requirements
Minimum Octane Models 50, 60, 65WMLEO, 70 65RS, WMLC, WMYC Recommendation See fuel classifications belowSee fuel classifications below(R+M)2 "AKI" 87 87 "RON" 90 75
PCE0020
Preferred Fuel: Any regular unleaded, regular leaded, or premium unleaded gasoline having the recommended octane rating, and not extended with alcoholAcceptable Fuel: Any of the above gasolines with up to the following percentage alcohol by volume :
10 ETHANOL or METHANOL with cosolvents
INote 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 performance