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My present recommendation is that, if you want to, you may use a synthetic gear oil of good quality.
While there can be other causes that a change to a thicker oil will not help, in this instance you CAN try the thicker oil, such as 85W140 or similar.
For a synthetic oil, I am presently recommending only Spectro brand gear oil, in 75W90 in the version version called "Platinum", for the transmission & the rear drive of Airheads & Classic K bikes.
I have no objection to it being used in the driveshaft (of those models using oil there).
In the past I recommended you use ONLY a quality GL5 oil in your Airhead transmission; preferably in grade 80W90 for most conditions.
BMW did not restrict use of petroleum and synthetic oils, stating only to use a GL5 oil, & that it be a Brand Name (BMW-speak for "quality ").