The way I interpret the VR1 oil is that it's a high performance street oil and Racing in the name is a marketing device. I was trying to find the PDS of other oils, Castrol, Rotella, Pennzoil, etc, to see how they compare, but unless I overlooked it, none of them list the zddp content, among other things.
I have friends involved in local circle track racing who happen to use Valvoline racing oil. It is not VR1 that they use.
The big difference I see in the between the Valvoline VR1 and the actual Valvoline racing oil is lack of detergent in the racing oil.
For what it's worth, I've used the VR1 in my engine since it was first fired, with no additional additives, and have had no problems that I can blame on the oil.
Also for what it's worth, I ran regular Valvoline for about 11k miles before building the engine and there were no signs of abnormal wear. I even ran Mobile 1 for 1 interval.
An interesting observation is that all of the conventional Valvoline multigrades have the same ZDDP content, all the way from 5w20 to 20w50. It was previously my understanding that all 40w and higher have higher content which is sufficient for older engines but that's clearly not the case looking at the PDS for the Valvoline products.
My honest opinion about it is once the engine has a good number of break in miles, the oil used is not as critical as we might think, particularly for street engines with relatively light spring pressures, though I admit I am still leery about using just any oil. And I don't want to be the guinea pig. It's bad enough that new parts don't want to stay together. I don't need to potentially encourage them to come apart.
Lawrenceville, GA