Mine arrived with Castrol synthetic. I drained that shit right out of there, and replaced with a custom oil that I make myself in a small laboratory out behind the garage. It added 47 hp immediately, and the Tiger will even wheelie in neutral now.
If you don't produce your own custom synthetic oil, as was alread said, O'Reilly has moto oil, just not grouped with auto oil.
"I tried to move my mind there and nowhere else and imagine a single detail that, if I didn't see it that weekend, I never would... The world is easily lost."