My present recommendation is that, if you want to, you may use a synthetic gear oil of good quality.

There is no question in my mind, that HIGH QUALITY SYNTHETIC GL5-rated oils will, or can, PROLONG the life of your transmission (& rear drive).

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I recommended that you do use them unless: you live in an area where the temperature that you start the bike at will be ~100F or more (that also means the un-started engine temperature generally), and that you will be riding fast &/or with heavy loading, or pulling a sidecar or trailer ...in very hot weather ... There is an exception; some transmissions will stiffen-up gear changing when the oil is hot.

One such additive is made by Dow Corning and sold, $$$$, by bearing sales companies.

I do not recommend ANY additives except in very special circumstances.

Thus, at most any temperature you will be riding at, even after a full warm-up, the oil is thicker, a lot thicker.

NOTE ALSO that the thicker oil will have more horsepower losses associated with it ...friction within the moving oil itself too ....besides the various gears, etc., changing shifting characteristics due to different slow-down and speed-up slowing.

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).

While straight grades are listed in the Owner's Handbook, the only listed multigrade oil is 80W90.

Link #5: has never waivered in its Airhead motorcycles' transmission oil recommendations, and this includes the last Airheads.

The biker community, like many other groups, has its own jargon, wit, and words of wisdom.