1995 Johnson/Evinrude Outboards 25, 35 3-Cylinder Service Manual, Page 21Get this manual
FuelOil Mixing Instructions
To be used if engine's oil mixing unit is not desired
Gasoline 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 tanksAlways mix in well ventilated area
Portable tankAbove and below 32 (00 C), add one gallon (4 litres) of fuelPour in required amount of oilAdd remaining fuelInstall filler cap and tip tank gently to distribute oil
rn WslowlyPermanently Installed TankAbove 32 FF (00 C), 1 pour oil with the fuel as tank is filledBelow 32 (00 C),
add one gallon (4 litres) of fuel to separate containerPour in required amount of oilInstall filler cap and tip container gently to distribute oilSlowly pour oilfuel mixture into tank with fuel as tank is filledTo prevent static spark, use large metal filter funnel as shown in figureThe fuel nozzle must contact the metal funnel when filling the tank