I have 45 hours on my engines. I changed the oil and filter this weekend. Two engines, two oil changes. It took longer than I thought it would. I took the oil tanks off the engines and then drained the oil. The filter had more oil in it than i had been led to believe based on the rotax video guide. Next oil change I will put a little bowel under the filter.
I also removed, cleaned and gapped the plugs.
The engines are running good.
There was a SB out concerning the push rods. I inspected my rods and everything was OK.