Looking for your thoughts to help keep my 2013 honda rubicon running for many kms

I ran gn4 till 1000km then switched to hp4s honda full syn

Its currently sitting at 2600km

Do i keep putting syn in it every 1000 or run gn4 change every 500km( im old school and sort of beleive in dino oil)

I use oem filters
Do my air filter regularly
Change my diffs once a year

At how many kms should i do valve check?

Any input to help her last many kms would be great
Thanks