Im sure some have seen these videos but a youtuber by the name of tenza motorsports has done a test on mobil 1 vs amsoil if anyone cares to watch.
https://m.youtube.com/watch?v=RHk_fibP2wA Part 1
https://m.youtube.com/watch?v=wak8bnOBbM8 Part 2
https://m.youtube.com/watch?v=RHk_fibP2wA Part 1
https://m.youtube.com/watch?v=wak8bnOBbM8 Part 2