Don't take it personaly, it's not about amsoil, its about service intervals and what oil to use. They say spark plugs can last 100k miles, I believe that they can...however would I test that, should you test that? One could, who cares? I wouldn't.
There is more to service intervals than oil changes and how often they are done. If you get under the hood every 3k you stand a chance of finding that cracked belt or squishy hose and be able to fix those sorts of problems before they cause a breakdown.

My BG rep shows me all kinds of data about the wonders of BG products (most are excellent) but that data and stats will not change how and when I service my rigs or customers rigs. Just because a stat says that my service interval can now be a year, instead of 3 months, will not make me any more likely to want to be a test subject with my transportation. Just because you can does not mean you should.

SD