PQIA uses D2896 TBN testing. Their results are not wrong, they just are not comparable to D4739 results. Read my last post on the differences between the two tests.So what I hear you saying is that PQIA is all wet and got it wrong?
In short, D2896 is for testing new oil to compare to other new oils. D2896 is never used for testing used oil.
D4739 is for testing new oil to compare to used oil. You can test used oil to see if the TBN has reached its end of life, or you can test new oil, then follow up with a test of the same oil after it was used to see how the TBN result dropped over the life of the oil.