It looks like Mobil just takes Mobil1 0w40, adds more VII to get it to a 50 weight hot, way bumps it up to 18x the moly, and 2x the ZDDP.
Really shows they believe in moly for extreme running.
Of course maybe there are more esters and PAO in the base oil, no way to tell from a VOA. Wish that part of the puzzle was available.
Starting with a sump of regular street Mobil1, use this stuff as make-up oil to keep the level at full over an entire OCI, replenishing used-up additives as you go.