Originally Posted by bee1971

3. 10W30 Valvoline VR1 Conventional Racing Oil (silver bottle) = 103,505 psi
zinc = 1472 ppm
phos = 1544 ppm
ZDDP = 1500 ppm

4. 10W30 Valvoline VR1 Synthetic Racing Oil, API SL (black bottle) = 101,139 psi
zinc = 1180 ppm
phos = 1112 ppm
ZDDP = 1100 ppm


What is the source of this information and how old is it?
In searching the internet for info on this oil I have seen so much conflicting data that it is no wonder people would change to Gibs.

In theory, there is no difference between theory and practice. In practice, there is.