Don't smoke crack and lurk the forum. This obviously (to me) isn't his first oil change, just asking at this mileage should he switch to a different oil.
I am leery of buying used but if I'm extremely thorough about pre purchase inspection, it's the way to go.
My 2014 GT bone stock, unmolested, not modded in any way when I bought it used was only $24k with 9k miles in January. I had Carfax service records of the fluid changes and any service.
i almost turned around and walked out when I arrived to look at it after a 3 hour drive when the salesman said with excitement that this ones got a tune on it....then said oh wait a minute , I'm sorry, no it doesn't. I acted disappointed to make sure he wasn't lying.
* sorry for thread hijack. I also wondered about switching to 5w30 Mobil 1 extended service but after remembering I DONT have any tick, never over heats, doesn't burn any, and the oil still looks decent at 4500 miles...then why switch?