I've been using Mobil 1 20w50 for years with no issues. I would guess somewhere close to 700 hrs now on 2 boats and I've never had to get in either motor. I'm outside of Austin and we ride year round. I tried switching to Valvoline VR1 20w50 this summer, but I didn't care for it. Seemed to be a little harder to start and the boat was a little rougher until it warmed up.
With the flat tappet motors, I need the zinc additive ZDDP, the Mobil 1 has been the easy choice because it was cheap in 5 qt jugs at Wally World. They stopped stocking those early in the spring. I've talked to a friend who is a store manager who also used it in his Mastercraft so hopefully he will get some more in his store soon.
The diesel oils usually have closer numbers, but I've always been a little nervous about the additive package they use with a gas motor.
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