Looking promising. However the supercharger on mine started making the noise in December 2020 and was replaced in January 2021 so that one definitely wasn't related to warmer outside air. And I found that it wasn't just about getting to engine temperature, either. I had to go about 20 minutes beyond that - then once the supercharger drive/supercharger itself had got hot, the squeaking then started... And sometimes it was a bit intermittent. So persistence is required.An observation I can make though before replacement is that I haven't experienced the noise on any journey since the outside air temperature has dropped below 20 degrees, So my feeling is that it is hot ambient air temperature related? therefore we may not know if replacing the supercharger has cured the issue for good until we go into spring and summer next year.?