This, 3rd in series, video, (with sound this time), shows that there is no difference when the beneath the decibelometer fan is working or not.
So the offered explanation why is such a big sound difference between the two oils, (LIQUI MOLY TOPTEC 4100 0W40 vs REDLINE 10W40 in this VW g60 engine, when there is a cold start at 30 C°, (ambient temperature), that the difference may be due that the fan is ON with the LIQUI MOLY video and OFF with the REDLINE, is not valid.
Do you like to replicate such a, very easily replicated, interesting I hope so, experiment?