If it is a new motor, and it is attached to a new Evinrude boat (or a new-to-you boat), congratulations! You may have a question or two about the best care and feeding for this fine machine. For instance, if you are dealing with a two-stroke Evinrude motor, you may be wondering what kind of oil to use. Their suggestions are XD30, XD50 and XD100 oil for two-stroke motors that are 1993 and newer. When it comes to the grade of Evinrude outboard oil to use, 87 octane is the current minimum, but 89 octane is actually preferred. Use of higher-octane fuels have not proven to provide any additional benefit, and may actually exacerbate hard starting conditions in hot weather.
If you are wondering about the proper ratio of fuel to oil for optimal performance in your Evinrude motor, a breakdown given on the company website is as follows: 1958 and prior used 20 parts fuel to 1 part oil; 1959-1963 used 24 parts fuel to 1 part oil; 1964 and newer use 50 parts fuel to 1 part oil. High performance racing usage requires a ratio of 25 parts fuel to 1 part oil. Finally, when it comes to gearcase oil type and capacity, refer to your owner’s manual for specifications.