1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Manual, Page 51Get this manual
Off-Season Storage Use the following procedure to properly prepare Johnson and Evinrude outboards for extended periods of nonuseThese steps are intended to protect the engine during storage and simplify the preseason servicing procedure1Stabilize the engine's fuel supply with OMC 2+4 fuel conditionerAdd one ounce of OMC 2+4 fuel conditioner for every gallon of gasoline
INote.I Use flushing to prevent engine oroperate pumpengine on attachment if you the trailer or dolly water damageengine's propeller before starting engine to prevent accidental contact with moving propeller2Run the engine at approximately 1500 RPM for five minutes to ensure that the entire fuel supply system and the engine's carburetors are full of stabilized fuel3Prepare an engine "storage mixturein shop V6 six gallon tank PI 395744The mixture should include: Five gallons of fuel Two quarts of OMC Storage Fogging Oil PI 171703 One pint Evinrude or Johnson Outboard Lubricant One pint OMC 2+4 fuel conditioner PIN 174275