I have always used Mercury oils (gearcase and 2 stroke) and am wondering about the possibility of using something else. Cost is a factor and improved performance.
Mercury or Yamaha surely don't make their own oil. They are labeling it themselves but it is probably made by some oil company to their specs. Mercury will recomend their oil because they want to sell it, but something else is probably just as good or even better. Thoughts? Opinions? Facts?