Zinc Additive for Flat Tappet break-in?

dgc333 said
Caution about Valvoline VR1. Some of the versions are SM rated and will not have any more ZZDP than any other SM rated oil. Can't get the SM rating with the higher ZDDP content.

The only versions that I'm aware of are the different weights:

10w-30

20w-50

Straight 30, 40, 50 and 60.

Please let me know where you have heard this and which weight VR1 has been affected.

Thanks