To really discover the "best" is to have spec sheets with breakdowns, over large distances with specific intervals of testing
I've had Blackstone oil labs run tests on T6 in my WRX at 6k internals over 90k with great results..... All levels where they should be for metallic breakdown, etc. (2.5L turbo stage 3)
I've done the same with Blackstone labs for Motul 8300 at 5k intervals over 100k on 1.8t B5 stage 3 Passat, with same results.
I've had Blackstone oil labs run tests on T6 in my WRX at 6k internals over 90k with great results..... All levels where they should be for metallic breakdown, etc. (2.5L turbo stage 3)
I've done the same with Blackstone labs for Motul 8300 at 5k intervals over 100k on 1.8t B5 stage 3 Passat, with same results.