Welcome to the site!
It is a group III mineral oil period.
The how long and miles falls under the type usage ect
There are many oils available as you probably know,look for one that has a low cP pressure in the data sheet for cold start and flow and you can always step up a grade when the weather gets warmer
Good luck looking for your oil of choice and you will notice,opinions will vary although the large percent here I think will agree a group III oil is a waste of money vs performance,at least the group III's that are offered currently
Shaeffers hase a nice 10/30 blend that will pump better when cold that it's own 5/30,,Mobile Drive Clean Blend is the only other over the counter blend available I think.
There are many good dollar a quart oils available,just depends on your driving style and needs