I have a new fishing boat coming with a Yamaha VMAX SHO 200 and started doing some reading on oil for it. Sounds like Yamaha wants their Yamalube 4M or 1M, or an FCW oil in it, but I about spit my coffee when I seen what they get for the yamalube. I've read of guys running t6 5w-40 in smaller Yamahas with success, any experience with it in the 4.2 liter VMAX? I historically put ~20 hours per year on my big motor and plan on changing it every fall before storage. I'd like to find a full synthetic that will do the job and not cause any warranty issues (5 year factory extended w/ current promo) but won't cost an arm and a leg.