I took a bunch of seminars on Rotax Aircraft Engines and share the highlights of what I learned. You can find these seminars by going to https://www.eaa.org/videos and searching for Rotax. Here are the ones that I used as sources for this video:

By Dean Vogel of Lockwood Aviation:
Rotax 912 Maintenance and Inspection Tips
https://www.eaa.org/videos/2242926960001

By Phil Lockwood:
Rotax 912 Engine Installation & Operational Tips
https://www.eaa.org/videos/6275881077001

By Jorge Tavio, Rotax Flying Safety Club instructor:
Rotax 912iS Sport Engine Overview
https://www.eaa.org/videos/6073271269001

Getting to Know the Rotax 915 iS Engine
https://www.eaa.org/videos/6158281979001

916iS The New Rotax Engine
https://www.eaa.org/videos/6331066065112

By Prof. H. Paul Shuch:
Care and Feeding of the Rotax 912
https://www.eaa.org/videos/3503823469001

Pushing Past TBO Running your Rotax Engine "On Condition"
https://www.eaa.org/videos/6238916595001

Keeping your Rotax Alive
https://www.eaa.org/videos/6189505137001


00:00 Intro
01:15 About the Rotax company, history
02:53 TBO
04:26 Oil system
04:52 Corrosion protection
06:18 Tight manufacturing tolerances
07:54 Gearbox
08:59 Overload clutch
10:05 Turbocharged
10:30 Injected vs Carbureted
11:20 Engine computers
12:38 Lane light diagnosis
12:51 Closing