I found this page to be VERY informative. Assuming it' true. The gas in tank analogy was excellent and easy to understand for sure!
http://bestmotoroil.weebly.com/
And since I find the need to run dino and not synthetic oil (Syn caused more oil leaks for me for sure), I'm happy with my selection of Valvolin VR1 as being the highest rated, non-syn street oil. I just hope the 20W50 has the same rating as the 10W30.
7. 10W30 Valvoline VR1 Conventional Racing Oil (silver bottle) = 103,505 psi
zinc = 1472 ppm
phos = 1544 ppm
moly = 3 ppm
__________________
Adam
__________________
1964 LeGTO
469, M21, 3.42
__________________
Sold:
1968 Pontiac LeMans Convertible
See it go
HERE