This site seems to have good info about oil for the Rotax:
http://airplanepilot.sportaviationcenter.com/airplane-lsa-pilot/maintenance-inspections/rotax-airplane-operations/rotax-oil/
Cheers,
Greg
http://airplanepilot.sportaviationcenter.com/airplane-lsa-pilot/maintenance-inspections/rotax-airplane-operations/rotax-oil/
Cheers,
Greg