I use Rotella 15W-40 in my '49 Chevrolet 3100 with a 216 cu.in. 8-10psi at idle and 15-18 on acceleration. Like the Rotella because of the zinc level and other additives that help protect these flat tappet engines.
Tim
"Pay attention to the details! It ALWAYS pays off."
1949 Chevrolet 3100 Series 1/2 ton Pickup 1964 Chevrolet C10 (Ol' Yella) (SOLD) 1958 Chevrolet Biscayne 2 door (SOLD) 1970 VW Beetle