Rotella T's been a good standard 2-stroke-rated oil for years. A real old standby. I'm sure Karl's right on about the Exxon, too. I've heard it talked about. As for finding Rotella, I buy mine at the local NAPA really cheaply.
There can be plenty of debate about which oil is best, which you may even see here on this thread. I'd start by asking a question -- of the marinas you're likely to frequent, which brands do they stock in the 1 gal. containers? I ask because no matter how well prepared you are with spares & jugs for all the things your boat needs, there will come a time when you're caught short on your own oil supply when fueling or getting bait, etc. At that time, you're going to want to know that the marina you're at has the oil you use. I don't know about you, but I HATE mixing brands of oil. I'd sooner take even an arguably lesser brand of oil but keep only that oil in the crankcase than go with the ultimate, but have it be kind of a rare bird with the local suppliers and be forced to mix something else in occasionally.
It's probably really hard to go wrong with any of the 2-stroke-rated oils, as they're all pretty high grade. They have to be in that demanding application. You can be that much more confident when you see the old school charter captains using Rotella, Delo 400, etc. Those boys put more hours on in a week than some of us do in a season.
