In cases where a conventional oil is perfectly adequate, using something "better" is often equivalent to using stainless nails in the construction of a house. Are they better? Sure. Do they do anything better in ordinary, non-salt-soaked wood)? No. Do they cost more? Yes, a lot more.
Synthetic oil, especially in small quantities for an ATV do not cost "a lot more". You are literally talking about a couple bucks. It sure helps on mornings when its cold and that to me is worth a couple of dollars
