Originally Posted by Axis_of_Evil
I use non-synthetic Valvoline VR1. It has 1400 ppm zinc and 1300 ppm phosphorus specifically for flat tappet engines. VR1 comes in several weights and in either synthetic or non-synthetic.
I believe 1200 ppm is generally considered minimum ppm zinc for flat tappet engines.
I'm curious on how many miles ur running the motor before you change oil?
Also, if it is a daily driver? If it was, how often would oil have to be changed?