Theres a whole lot wrong with some of what I read on that site.
I'll give you just 1 example of how sometimes non-OE filters are bad for your vehicles. Case in point: Fram filters vs OE filters and the Chrysler Minivans. Mopar filters have a small valve/hole inside them that Fram and many of the others dont have. This simply hole might not seem like a big deal, But start using those aftermarket filters on high mileage engines, and you get *TICK TICK TICK CLACK CLACK CLACK*. This silly little difference means than many non OE filters won't oil pressure to build up as quickly, and pressure builds up in the filter, which translates into inadequate oil filtration.
I experiences with this on Mitsubishi's vehicles, a older Nissan V6s, Hyundai's 2.0 from the early 00s and prior and several others. In all these cases, these were engines weren't forgiving with respect to oil pressure at idle.
And yes, oil does break down. For those that don't believe me, we have a bunch of uncontaminated oil that has sat on the shelf in a dry stock room for a few years that has separated.
36ft Damon Intruder Class A - 37ft National Sea Breeze LX Class A
-Past RVs: 19ft Sportsman, 24ft Jayco, 30ft Coachmen Mirada. We had some good times.
"Im a car guy...you've been warned" lol