I'm old school WRT oil changes.

If you want to use any synthetic, start when the engine is new (or rebuilt). Switching from regular to synthetic is a good path to leaks....

Change the oil periodically. If you drive short or stop and go trips, change it more frequent, about 3000 miles.

If you do long periods of highway speed, you can stretch out to 5000-6000 miles.

Oil will build up acidic residue that needs the heats to keep in check.

I don't have any experience with the Mobile 1 Annual Protection. It does go against my feelings about oil change frequencies. I keep fresh oil in my vehicles....