You can’t easily get away with using a different grade of oil without experiencing serious problems as a result. When you have a motor that is made by a specific company that makes a lot of other boating equipment, it is much more important that you use the right oil. The right oil is made to make these motors operate well.
For example when I bought a Mercury outboard motor, I knew that I would not be able to use just any old oil. To make sure that the motor ran as efficiently and expertly as it was intended, I had to make sure that I used the Mercury engine oil that actually went with it. Only this type of oil could ensure that my motor kept working the way that it was intended to.