You bring up a great point, that these manufacturers change their formulas quite frequently...sometimes just a little, sometimes a lot. Valvoline comes to mind - it wasn’t that long ago that they were one of the few major brands that didn’t adhere to the moly formula, instead relying on sodium. They weren’t the only ones, but they were the biggest name I could think of...Super Tech was doing it as well. House brand NAPA and Carquest...a few others.
They‘ve all since changed and now run similar additives as the rest of them with moly hovering around 70 and sodium dropping down into the negligible amounts.
TGMO had a big change in their moly count too at one point, and probably at several points - where they once where the moly kings of automotive land, they since have dropped those counts down (although depending on who you believe it’s because they now use a “higher quality” tri-nuclear or something, moly). And let’s not forget that direct injection has changed the game for some oils as well, as they fight to get those NOACK numbers down on thinner oils.
But years ago I stuck with 3,000 mile intervals on Super tech conventional - but this was 20 years ago when conventional oil and shorter intervals were the norm. And most likely Super Tech changed multiple times while I used it and didn’t notice (or care).