You gearbox oil and engine oil are the same and when you change oil in the engine it is done for both. There is nothing to do to the gearbox. Use a good full or semi synthetic motorcycle oil. Do not use a car oil because it doesn't have any ZDDP which is there to help protect metal surfaces like our flat tappet lifters and gearbox gears. If you are using 100LL use the semi synthetic.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
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