What is the fuel mixture for a 1990 Johnson 15 model J15RELESR?

The fuel mixture for a 1990 Johnson 15 model J15RELESR outboard motor is typically a 50:1 ratio of gasoline to two-stroke oil. This means you should mix 2.6 ounces of oil per gallon of gasoline. Always use high-quality two-stroke oil and ensure that the gasoline is fresh and free of ethanol if possible, to maintain optimal performance.