[G.M.]

I don't use MMO in the oil just the gas. Use a good oil and it don't need any additives due to what's in the oil and the frequency of changes. I have used Castrol 20/50 for well over 30 years but due to a recent oil study I swithched to 15/40 Valvoline Cummins Blue for my diesels. I liked the additives which include zinc and molly so I decided to try it in the old Fords and put in the 39 conv and P/U on the last oil change. I didn't notice any change change in oil pressure going from 20/50 to 15/40. Attached is the oil report I based my decision on. Oil is a personal choice and you have to make your own choice. G.M.