Intersting topic because the term, "extended.." only generally refers to number like 3,000, 5000 miles or 5,000, 8,000 etc kms. Owners manuals are already reflecting OEM base lines, ie. using numbers like 8,000 kms & 12,000 kms. This suggests to me the the term "extended" should be expanded to "extended from what?" I agree w/ A.O.
If a brand claims to have ability to "extend oil change interval", then "show me the facts" would apply.