The sell sheet from one of my Pennzoil-Quaker State suppliers (I'm in Canada, so take it for what it's worth), shows the following products as no longer available:
QSUD 5w-50, QSAD 10w-40, 20w-50, HD 30. Pennzoil HM 10w-40 isn't even listed, and I assume they're totally out of stock and it's not being replaced. It looks like several products are simply being amalgamated. The QSAD 10w-40, 20w-50, and HD 30 will no longer be available, at least from my supplier, but the PYB versions will be. Certain Shell and QS driveline lubricants are also disappearing from there, with references to use the Pennzoil products.