5w-20 Mobil 1 and Wix extended length filter. 10k change intervals. Syn is designed to go those distances.
There is a lot more to oil life than distance driven. Engine hours, revolutions, cold starts, operating time at/below/above operating temperature, ambient temperatures, etc.
Synthetic oil is designed for low temp pour characteristics and resistance to thermal breakdown. Purity is another benefit. But it isn't really the oil that breaks down, it is the additives. And the accumulation of acids from condensation is another problem.
Don't have to believe me, send your oil for an analysis (Blackstone labs, etc.) and see how much life is left in it at 10,000 miles.
I can not think of a reputable source that suggests going more than 6 months without an oil change.
Its not the miles (or months) per se, it is the operating conditions or actual use of the engine.
Consider this rough example (lifted from a BITOG post, link below)
Mileage has little to do with how oil is monitored, here is the idea:
If you drive 90% of the time on the highway lets say 1500 rpm an hour.
you engine sees 90,000 revolutions in that hour and you drive 60 miles.
If you drive around town, profiling with 90% of your driving in 1st, 2nd, and 3rd gear, taking 4,000 rpm on average. That's 240,000 revolutions of the engine in 1 hour and you only drive 30 miles.
Taking this out to 3 months , 90 days:
Car#1 3,600,000 rpms and 5400 miles
Car#2 21,600,000 rpms and 2700 miles
This represents 1 hour of driving a day for 90 days.
Car #2 sees 6 times the engine duty of car #1 and Only half the mileage