What kind of oil do you use for 4 stroke 50cc scooter?

From what I have been able to research most manufacturers recommend using 10W-40. You should change oil every 500 to 800 miles. And it is better to use a synthetic oil versus a mineral oil, eg; Mobil 1 synthetic, as synthetic oil does not create the sludge that is prominent with standard petroleum based mineral oil. Hope this information is helpful.