1978 Evinrude Outboards 9.9/15HP Service Manual, Page 13Get this manual
ENGINE FUEL AND LUBRICANT RECOMMENDED GASOLINE: Use gasoline with the following minimum octane numbersPUMP POSTED OCTANE NUMBER Research Octane Number Most Commonly Used in the Past 86 91
Below 32 (0 C) Portable TankPour apprOXimately one gallon (4 litres) gaSOline into tank, add required lubricantReplace filter cap securelyThoroughly mix by shaking tankAdd balance of gaSOlineBuilt-in TankIn separate container mix all lubricant needed with one gallon (4 litres) or more of gasolineUse large metal filter funnelPour this mixture slowly with fuel as tank is filled
Automotive gasolines regular-leaded or lead-free meeting these minimum octane numbers may be used; however, best results will be obtained by using lead-free gasoline
When operating in any other country than the United States, Canada or Australia, any gasoline may be used which will satisfactorily operate an automotive engineLUBRICANT: Use Evinrude Outboard 50:1 lubricant which is BIA certified for service TC-W (two cycle-water cooled)It is formulated to give best engine performance with least combustion chamber deposits, least piston varnish, maximum spark plug life, and best lubricationSee inside back cover If Evinrude lubricant is not available, another BIA