Mobil One has gone thru many reformulations.
According to our testing and by speaking with them, we have concluded that they used to be great but, during the late 90's and early 2000's they were less than great and many swore off, at and against but now, they are back in the good category. I had 75,000 miles on a F150 5.4 that was clean as a whistle on Mobil 1 changed every 3000 and running strong on the modified Lightning motor with 25000 miles changed every 3000.
On a modern motor, as long as you don't go extended intervals, I am not sure any of todays oils will make a difference plus or minus minutia no matter what they claim. Piston slap and other related issues I would be are more a mfg issue than
oil.