While looking around for oil information I found that Valvoline is one of the easiest brands to check out, as they have their Product Information linked to about anything you can pour.

Another avenue for oil with a sufficient amount of anti-wear compounds is four stroke motorcycle oil. I can't buy VR1 at my local Walmart but I can buy Valvoline 4 stroke motorcycle oil which has zinc/phosphorus concentrations of around 1100. A quart is $4.69 locally. There are other brands but I haven't checked them out. Oil bath clutches in motorcycles seem to need a higher concentration of antiwear compounds than newer automobile engines.

I don't know what the other additives for motorcycle oil do in a 440. Maybe someone else does. Experts?