I use Stabil in the fuel if the vehicle is going to sit more than a couple months. Especially important if you live in a humid climate.

As for oil, I use Valvoline VR-1: https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=1036547&page=1

In the Stovebolt Gallery ~~ "The Orange Crate" 1965 C10 SWB Step Side Build Thread

Inspired to be different. Different in a way of my own, not in a way that others strive.