This can be a fairly hot topic with many answers and opinions. Easiest to stay with Aeroshell because it was designed around the Rotax, but there are other decent synthetic and semi synthetic oils out there.
I have seen people use:
Amsoil motorcycle oil,
Honda GN4,
Golden Spectro 4,
Mobile One 4T
Rotax can't possibly test all the oils around the world for thousands of hours. I find it just as easy to order Aeroshell as any other.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
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