I agree with needing some TBN, but I have never seen a diesel UOA that TAN has crossed TBN, much less where it would be an issue contributing to wear so I do not place a high value on having a large starting TBN in a diesel oil. Dave - you have a large stack of UOAs, have you seen any?
Originally Posted By: dnewton3
I'd agree that all internal combustion engines running on fossil fuels are going to need some amount of acid fighting components; typically the TBN to combat TAN is how we refer to it. However, after seeing a lot of UOAs where TAN crosses over TBN, and yet nothing happens to wear rates, I'd say it's essentially moot.