I have seen various comments about making sure that the TBN level is >2 and how the oil is OK "until the TBN is used up". It is possible that in their zeal to control acids for long OCI that some suppliers formulate their oils too basic? If so, then would it be true that new oil would not be as "good" as that same oil that is slightly contaminated with acid, making a more neutral mix? I am thinking that rubber seals, etc would deteriorate in the presence of a strong acid or a strong base....
Some questions:
1) What are the max ranges of TBN observed on new oil?
2) What is the TBN of M1 5W-30?
3) Assuming constant acid comtamination of the oil due to the same stop-and-go driving and same driving routes on the same car, is TBN "used up" linearly or does it suddenly drop off?
4) Are all additives the same in this regard? In other words, does one oil's additive package stand-up to acids as well as another's? Which oils are better at maintaining TBN?
Thanks for your advice!
SWS
Some questions:
1) What are the max ranges of TBN observed on new oil?
2) What is the TBN of M1 5W-30?
3) Assuming constant acid comtamination of the oil due to the same stop-and-go driving and same driving routes on the same car, is TBN "used up" linearly or does it suddenly drop off?
4) Are all additives the same in this regard? In other words, does one oil's additive package stand-up to acids as well as another's? Which oils are better at maintaining TBN?
Thanks for your advice!
SWS