1975 Johnson 4HP 4R75, 4W75 Outboards Service Repair Manual P/N JM-7503, Page 11Get this manual
Quality of the image is intentionally reduced!
ENGINE FUEL AND LUBRICANT RECOMMENDED GASOLINE: Use gasoline with the following minimum octane numbersRESEARCH OCTANE NUMBER Most commonly used in the past PUMP POSTED OCTANE NONumber posted on gasoli