Originally Posted by MI_Custumz
Originally Posted by GomangoCuda
[quote=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.




Those numbers are from 540 Rat's oil blog. It's a super long read breaking down his independent testing and evaluation of popular motor oils. I've been doing a lot of research on high ZDDP oils lately, because I'm considering installing a new solid flat tappet in my 440. I already have the cam, lifters, oil and break in lube. The oil is the Gibbs 15w-50"break in oil" but I was surprised to find it ranked pretty low on 540 Rats lubricity test. I'm considering sticking with VR1 because its ranked highy by 540 Rat as well as what I used when breaking in my current SFT cam. The new cam is a Howard's SFT .550 int/.555ex -252/260@..050 . I'll be using the "direct lube" lifters for added insurance. Still considering returning it in favor of the Trick flow HYD roller cam and lifters. But I hear horror stories about hydraulic rollers too.. confused

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Last edited by Torquemonster440; 03/11/20 10:36 AM.
1966 Satellie.. 12.55 @107.75. 906 heads. 3780 lbs.