When it comes to using low quality oil in your outboard motor, some people swear that there are no problems and that boat owners should do whatever they feel comfortable with. The problem with that idea is that when it comes to boat oil you really do get what you paid for. If you didn’t spend the money for a premium brand, you will not be getting premium quality oil.
In some cases, people may use low quality oil without ill effects, making them think that this means that it is okay to always use low quality oil. In reality, it just means that they got lucky and that the motor happened to keep working even with this type of oil. I don’t feel comfortable trusting fate so I always use quality Yamaha oil in my outboard motor.