Most ATV's and Motorcycles share the engine oil with the transmission. So they require a special oil, not just a oil rated for car engines. If I dont use the factory oil, I run valvoline ATV/Motorcycle oil. Easy to find at autozone.
My rincon, I have strayed, and I run rotella 5w40 diesel oil in it. It runs a lot smoother, and the torque converter does not chirp from lack of oil at cold starts anymore...
i would go with the amsoil, valvoline or honda gn4 on the rubicon and i am not sure in the polaris- they do some kind of green oil or something, i only know one guy that has a polaris and he uses only polaris oil.
I use valvoline atv in my 04 recon. Its cheap and I have noticed a difference horsepower wise. You can find it at Autozone back by the oil on it own little rack. Its like 3 buck a quart. Hope I have shead some light on your problem.
i use the same rotella 15w40 dino as i put in the truck... this thing has been through heck, i can't describe how hard i have road this thing or how much and it still starts and runs good, i wish it had a odometer or a hour meter because it has to be a insane number
i did have to rebuild the motor in about 98 though but that was due to it being submerged in a pond
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