1993 Johnson Evinrude "ET" 90 degrees CV Service Manual, P/N 508285, Page 28Get 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+4fuel conditionerAdd one ounce (30 ml) of OMC 2+4 fuel conditioner for every gallon (3,8 litres) of gasolineUse flushing attachment if you operate the engine on trailer or dolly to prevent engine or water pump damage
ill propeller before starting engine to prevent accidental contact with moving propeller
When using flushing attachment, always remove engine's
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 fuel quarts OMC Storage Fogging Oil pint Evinrude or Johnson Outboard Lubricant pint OMC 2+4 fuel conditioner