1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 46Get this manual
Engine Fuel and Lubricant Lubricant: Use Evinrude or Johnson 501 Lubricant which is 81A certified for servicing 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 lubricationIf Johnson or Evinrude Lubricant is not available, another BIA certified TC -W lubricant may be used at the recommended 50: ratio for all modelsthe use of the following, as they will contribute to deterioration of your engine andor shorten spark plug life:
Avoid Use Of: Automotive oils Premix fuel of unknown quantity Premix fuel richer than 50: ratio Oil and gasoline not leaner than the recommended 50: mixing ratio
Some additives in 501 Lubricant are subject to evaporationAlways cover partially used cans to prevent deterioration of lubricant
Fuel Mixing Instructions Always use fresh gasolineGasoline is extremely flammable and highly explosive under certain conditionsAlways stop engine and do not smoke or allow open flames or spark near the boat when refueling or changing fuel tanksTo prevent fuel spillage in boat, remove portable fuel tank from boat when refuelingAlways mix in well ventilated areaPortable TankPour approximately litres (1 gallon) gasoline into tank, add required lubricantReplace filler cap securelyThoroughly mix by shaking tank Add balance of gasolineBuilt-In TankTo prevent static spark use large metal filter funnel as shown in figurePour the lubricant slowly with the fuel as tank is filled, or in separate container mix all the lubricant needed with litres (1 gallon) or more of gasolinePour this mixture slowly with fuel as tank is filledThe fuel nozzle must contact the metal funnel when filling the tankFuel Mixture50:1 Ratio