I contacted Shell (Pennzoil and Quaker State) late last week and the guy on the line, Wayne is his name, who I have talked to before said:
"according to my lab technicians and one developmental scientist, remember they are just leaving now for the day, Pennzoil Platinum and Quaker State Ultimate Durability have a TBN of between 8 and 9."
So I said to him that I would prefer an exact number so I can find the best possible product for my vehicles. So he replied:
"why would you even care about the TBN, that only matters for diesel applications! You can always check out the website at www.epc.shell.com:
So, I told him that the information that I am requesting is not available online, and proceeded to let him know that I will be continuing to use Valvoline SynPower as Valvoline is not afraid to public release all of their data and information in a TDS.
So, if you are trying to find the information out from Shell, good luck, as even their "developmental scientist" doesn't even know for certain - just a general broad range between 8 and 9.