1992 Johnson Evinrude "EN" 60 thru 70 Service Manual, P/N 508144, Page 30Get this manual
Off-Season Storage Use the following procedure to properly prepare Johnson and Evinrude outboards for extended periods of non-useThese 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+4fuel conditioner for every gallon of gasolineUse flushing attachment if you operate the engine on trailer or dolly to prevent engine or water pump damage
When using flushing attachment, always remove engine's propeller before starting engine to prevent accidental contact with moving propeller
2Run 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 mixture" in shop V6 six gallon gas tank PIN 397767The mixture should include: Five Two One One gallons of fuel quarts of OMC Storage Fogging Oil pint Evinrude or Johnson Outboard Lubricant pint OMC 2+4 fuel conditioner