A buddy of mine is a marketing director for Valvoline's commercial and industrial lubricant division.
Last night over dinner I brought up the subject of lower zinc quantities in today's modern oils and how a lot of us are concerned about excessive wear on our flat tappet engines.
So, he had a couple of guys in their tech department contact me today.
One of them sent me the attached .pdf file that helps answer some questions and gave me permission to post it here.
The Valvoline oil that is labeled "not for street use" has a very high zinc content but is not formulated for a daily driver. There is a fine balancing act required for detergents and other additives needed for a street engine.
They recommended their VR-1 oil for street engines.
Check out the attachment.
I know this sounds like an ad, but that's not my intent with this thread. I can't count the number of threads we've had on here related to oil and zinc additives.
I definitely trust these guys over some of the other online oil "experts."