The packaged OEM and other private label brands (Walmart, John Deere, Kubota etc) will meet the OEM's minimum specs. No more, no less. It is typically produced by the lowest bidder and when things are made by the low bidder, often times short cuts are taken in order to make a profit.
Example This Antifreeze Is Defective: It Froze Solid
The same goes for automotive oil filters.