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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 ").
While straight grades are listed in the Owner's Handbook, the only listed multigrade oil is 80W90.
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 also said that you could use 75W90, 80W90, or 85W90, depending on weather.
In the past I recommended you use ONLY a quality GL5 oil in your Airhead transmission; preferably in grade 80W90 for most conditions.
Shifting smoothly--preloading the shift lever and why. I am putting 5 links at the beginning of this article to help with understanding.
MORE throwout bearing information is here: folks have problems understanding, let alone visualizing, how BMW transmissions operate.
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I also have NO objection to Castrol 80W90 GL5 oil in -synthetic; NOR do I have any objection to any of Spectro's GL5 rated gear oils, in appropriate SAE viscosities.