but it is something on my Gl1000 I do not worry about, so I am not sure why I should on the M3W?
I think concern over the bevel box goes back to some of the early cars that had a misguided oil additive put into the box which tended to clot up and stop lubricating the internals with the attendant risk of failure. So long as the oil with the additive was flushed out of the bevel box that risk of failure is largely gone. The noise from some (many!) of the bevel boxes is different and does appear to be worse once it is up to temperature but whether or not cooling the box actually helps with the noise is a bit of a moot point. It certainly makes things more complicated if you want to add in an oil cooler and pump.
