Originally Posted by Jesse
For a simple oil change just drain and refill the tank without leaving it empty for long. With the filter also, there's a little more to it. You should be able to google some good videos about what to do with each line when you pull the can to wipe it out. If you let oil out of certain lines you have to do a pressure purge.
There is a couple of other specific details recommeded by Rotax to be done during an oil change.
At the very least you need to get a copy of the Rotax 912 Line Maint. Manual
You can down load .PDF copies of all the manuals from HERE