When you choose oil for your boat engine, want something that will perform well and maintain the performance of your boat. You don’t want to choose oil that leads to problems with your engine later on that might cost more than you saved on that cheap engine oil.
As a good compromise, my father discovered that Yamaha 2m oil was a good fit for his outboard motor. He found that he could get it for a reasonable price and the piece of mind he received from using the correct oil was worth the little extra he paid for it. When he used the oil, he never had any problems with it. It was perfectly made for his Yamaha outboard engine so he knew that he could trust it.