I’m 75, have had 24 cars and 5 pickups ranging from a ‘51 Chevrolet to a ‘2021 BMW X3, so my sample of 1 person must be tops. I’ve had ignition system, fuel system and cooling system problems but never an oil related problem if you exclude my ‘85 S-10 Blazer that dumped it’s cool and into the crankcase through a failed manifold gasket. Oils all over the map with one caveat - never have bought cheap oils. I could rate the best oil as what BMW supplies as my 2000 and 2008 went over 20,000 miles between changes (per the cars oil monitoring system) without ever having to add. Now BMW has changed to yearly oil change and I don’t drive 20,000 miles yearly anymore. I have run nothing except synthetics for ages including in the 7 tractors I’ve had. Yup, I’ve run Amsoil - in my snowmobiles as they were the first I remember and we could run a low oil to fuel ratio in the mix your own and no longer had plug fouling problems. But picking one brand as better - with all the engines I’ve had over the years and no oil failures, how could I pick one? The people who really have info are the rental companies, the trucking companies, all of those with huge fleets. My example of one owner with many engines over 70 years (no, I didn’t get the ‘51 Chev new at age 5 - dad bought it for me uses at age 13) doesn’t mean squat.