TBN for Pennzoil old SL synthetic 5w20 UOA useful?

[High Plains Drifter]

Chk the other uoa's for similiar results as your application. May save you 10.00 which is enough for more oil.

 

[MikeySoft]

I'm about to get a UOA on Pennzoil old SL synthetic 5w20 oil. Pennzoil no longer markets this oil. I'm debating if I should get the TBN for this UOA. Part of me is saying it is only $10 more, the other part is saying I will no longer us this oil so why bother?