Originally Posted By: deven
Originally Posted By: 2015_PSD
Originally Posted By: 1JZ_E46
For example, AP doesn’t look stout on paper but it’s a superior oil in just about every way than those with “stouter” add-packs.
Based upon what?
The foundation of any oil begins with its base oil. Judging by the price point and OCI for this oil, I am willing to say that it has a better base stock that allows the oil to be in service for a longer time than other oils commonly found on the shelves.
I would disagree with this--price point does not necessarily equate to oil quality, but more towards marketing. In my experience (which is somewhat anecdotal), it is typically the TBN which determines service life along with other factors such as useage type, engine family, etc.
M1 AFE (which is not guaranteed to last x miles or time) performed the same as M1EP which is marketed to last 15K in my 2010 FX4. Hence, M1AP may or may not have a better base oil than the other M1 offerings, but it likely has a higher starting TBN and/or it has higher TBN retention than the others.
With all of that said, nearly everyone on this site does not use oil to its fullest, opting to change it early (I add myself to this group at times), therefore in most cases, it does not matter what the base oil quality or TBN is--we never need it.