I can't say Mobil 1 is the best oil available, but I have been using it since the 80's and have never had an oil-related issue with any of the engines. I change the oil on or before schedule for street only vehicles, use what the manufacturer recommends for weight, take the time to do a full drain and usually use either wix or OEM oil filters.
I've run some vehicles really hard, doing both off-roading with trucks and some track use by many of the cars (strip and road course with some unintentional off-roading
). Those vehicles were on short drain intervals, as short as 500 miles depending on severity.
BTW: I've run trucks with big block and small block V8s, Corvettes, tuned Nissan 240SX, Porsche 911s, Mitsubishi (Plymouth) Laser Turbo, Cadillac STS V8, Volvo S60 T6, built small blocks (400450 HP no power adders) in Camaros (68, 69 and 72). I'm forgetting some I'm sure. Point is, I've owned a large cross section of vehicles and they all have lived well with Mobil 1 in the pan/sump.