I run ONLY Johnson/Envinrude oil, my mechanic said to never use the cheap oil. He said if I was in a bind to use Mercury oil, said that would be the next best thing. With some things, you can go cheap, but with oil for a $15,000 motor, I think I'll use what they tell me too. I buy oil by the case and go through 2-3 cases a season and always keep an extra gallon on board just in case.
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