Re: 225 Mercury Optimax
I have a 225 Opti,I only use Opti oil, but I've never heard that it was a warranty requirement. My friend also has a 225 Opti, he had a 55 gal. barrel of Merc. Premium Plus and the dealer told him to go a head and use it. He's got close to 1000 hours on his motor with no ill effects.
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