If it were me; ask the dealer if there will be warranty issues if you use non yamaha oil. ( technically there shouldn't be as long as your using an oil that has the same or better specs for that engine. This is always a debate, but a little research will point you in the right direction. I've been through this time and time again with snowmobiles/ warranty issues using a non brand oil) and this is my opinion only, but I'd run 100:1 premix in addition to oil injection. If that boat isn't oil injected, my guess is it's 50:1 in which case for break in I'd run 40:1 for a full tank. I would run a non synthetic oil because synthetic is too "slippery" and won't allow the rings to seat fully as they should. Finally I'd limit my wot time, but in the same respect run it like I would normally. The ONLY thing that seats new rings is load on the engine and you won't get that putt-putting around the lake. After the first tank is gone if go back to whatever is specified oil ratio mix and a quality synthetic oil. Premium/ non ethanol only for fuel. Again, my opinion, and the exact way I'd do it if it was mine. Good luck and congrats on the new ride!
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