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I recommend that you NOT use any additive if your transmission is filled with synthetic oil.One such additive is made by Dow Corning and sold, $$$$, by bearing sales companies.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.Any oil will thin & thicken with temperature changes on 'its own chart curve'.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.There is a rating called Viscosity Index (VI or v.i.), which is the RATE of thickness change of the oil with temperature change. Link #5: has never waivered in its Airhead motorcycles' transmission oil recommendations, and this includes the last Airheads. My article is VASTLY more complete, particularly about 5 speed transmission problems.
Thus, at most any temperature you will be riding at, even after a full warm-up, the oil is thicker, a lot thicker.
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.
There are oils available that replace the "90" with 120 or even 145.
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.
My present recommendation is that, if you want to, you may use a synthetic gear oil of good quality.
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 ").