My bro is a mechanic and while he wasn't speaking specifically about marine oil, he told me that anything above a certain dollar mark, besides viscosity and additives, was a waste of money and that oil is oil. What do you fellas think of that?

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My bro is a mechanic and while he wasn't speaking specifically about marine oil, he told me that anything above a certain dollar mark, besides viscosity and additives, was a waste of money and that oil is oil. What do you fellas think of that?
I would stay with what the owners manual states. I have a 250XS and talked to a tech at Mercury he told me all of the testing and development on their motors (thousands of of hours) was done with the oil specified. How much oil do you use a month, 2 gallons? How much are you saving 20 bucks. I'm sticking with what the MFG. recommends.
