In other words the TBN analysis is meaningless
since a reading of 0.00 will likely cause or give you bad reading in your UOA Am I right?
Viscosity,wear metal,and contamination are the most important data.
One can assume that if the wear metal are within an acceptable level, that the oil remains in the original viscosity, and if the oxidation, nitration, and sulfation aren't out of range at the end of the OCI that the oil was doing the job or wasn't used for a too long period of time.
Am I right ??