Oil Analysis specific for rotax suggestions

I used Aviation Laboratories.  

Yes. AvLabs as Joseph said. I've been using them for 19 years. They are in Texas. They have one of the latest data bases for our engine. They test each sample three times. They will compare your engine hours to others with the same hours. They will email you the results with the comparisons. When I send them in I also get a copy. Take your sample mid oil drain. Not at the beginning or the end.

I have been using Blackstone Laboratories for several years and am happy with them. They are in Fort Wayne, Indiana.