Oil Weight

Penrite 15-50 which has zinc full synthetic in summer switch to a 10-40 cooler times only switched over to synthetic after 10k on engine , I always check pan for any metal particles when I drain and its spotless. I drop the oil every 3000 miles regardless . Call me anal but its cheaper than a engine rebuild. Sorry forgot to mention 318 Zero Decked, solid flat tappet Comps 268s ,EQ Mag heads bowl ported, MP valves, Crane 1.6 rollers with Jolmar rocker stud Girdle kbs 167s ,scat I beams A very healthy 318. Broken in and used Joe Gibbs mineral based oil for the first 10k than switched.