I am anything but a mechanic, as most any long time member here will confirm, but for what it's worth: I used dino oil in my 06 RK and got close to 36K before it was destroyed. Well, that was cause I was a bonehead and crashed it...:small3d031: On my new Ultra, I have used only Mobile 1 V-Twin oil. Anyway, I have noticed a marked decrease in engine temp this year. Heavier bike, bigger engine, neither had cats and both had the same modifications. Can only echo what many others here have said, I think the synthetic is worth the extra money.
I'm praying I don't wreck the Ultra and the better quality lube will pay me back with many years of happy miles. Good luck with whatever oil you choose. Ride safe, and keep the shinny side up. I promise that will extend the life of your engine as well!!:bigsmiley12: