1975 Johnson 4HP 4R75, 4W75 Outboards Service Manual, Page 57Get this manual
JOHNSON 50 TO LUBRICANT We recommend using JOHNSON 50 LUBRICANTJOHNSON 50 LUBRICANT is designed specifically for Johnson outboard motor use at 50 to gasoline to lubricant ratio for engine break in and after break in, new and older modelsThis improved lubrication is formulated to provide additional benefits such as: exceptionallubrication, less varnish and combustion chamber deposits, better spark plug life, good mixability with gasoline even in cold weatherand reduction of pre-ignition NOTE If Johnson 50 Lubricant should not be available, see lubrication
instructions Section USE ONLY THE RECOMMENDED OIL TO GASOLINE MIXTURE, REGARDLESS OF THE CLAIMS MADE FOR SOME OILS