1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 43Get this manual
Fuel and Lubricant Recommendations Lubricant Only the following lubricants should be used in the VRO oil tank, AccuMixTM oil reservoir, or for the recommended fueloil mixtures in fuel tank
Evinrude Outboard Lubricant Evinrude XP Outboard Lubricant Johnson Outboard Lubricant Johnson GT Outboard Lubricant OMC Cycle Motor Oil
They are formulated to give best engine performance with least combustion chamber deposits, least piston varnish, maximum spark plug life, maximum corrosion protection and best lubricationIf Evinrude or Johnson Outboard Lubricant or OMC 2-Cycle Motor Oil is not available, another NMMA certified TC-W lubricant (oil) may be usedLook for the certification information on the container label
INote mixture mayengine .onpowerhead damagean leaner than recommended fueloil result
INote Avoid the use of the following as life: could damage your they engine andor shorten spark plug
Automotive oils Premix fuel of unknown oil quantity Premix fuel richer than the recommended ratio Oil and gasoline leaner than the recommended ratio