Can an engine oil change be effected by a deteriorating Motor oil base number?

Why would it be of interest to know if an engine oil change can be determined by a deterioration in the Motor oil base number? Well quite simply; with the cost of motor oil (and oil filters) increasing every other month, no one wants to change oil unless it’s necessary.

Why does the deterioration in the motor oil base number indicate an engine oil change is due?

Base number testing, which measures