On another forum I said I’d never use oil for more than a year, even though I only drive 4000 miles in that time and here is part of a response I got:
""Wear rates are actually still going DOWN in many examples, at 10k miles. The SAE study I reference even shows that wear becomes almost zero (not absolute, but darn near) when the lubes get aged. I realize that it’s hard to believe, but there are multiple SAE studies and lots of UOA data to prove this. Unfortunately, the mass-market sales hype is far louder and broader than I would ever be.
Also, it’s not that the engine is really being harmed by short OCIs; that is not borne out by the data. … What is being harmed is the wallet! Why dump oil at 3k or 5k miles, that is capable of 10k miles? You can change oil at 2k miles, but your wear rate is HIGHER than at 10k miles by far."
(I agree that choice of oil change interval, like choice of lover, is a very personal thing.)