1993 Johnson Evinrude "ET" 90 degrees CV Service Manual, P/N 508285, Page 22Get this manual
Fuel Requirements
Minimum Octane Models 100WT, WM All Other Models Recommendations See fuel classifications belowSee fuel classifications below(R+M)2"AKI" 67 87 "RON" 69 90
PCE0020
Preferred FuelAny regular unleaded, regular leaded, or premium unleaded gasoline having he recommended octane rating, and not extended with alcoholAcceptable FuelAny of the above gasolines with up to the following percentage alcohol by volume: 10 ETHANOL or METHANOL with cosolvents 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 gasoline having more than 10 ETHANOL or more than 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: