I’m with Lane. I change my DD’s every 5K and new filter every 10K. I assay all my oil changes and everything is still in spec.
I used to own a BMW F650 with a Rotax single cylinder engine. I used Motul semi-synth in it because that was the factory recommendation. Interval was 6K, but I swear to god, almost as the odometer rolled over 5K the motor would sound like a box of racks and it was constantly slipping out of second gear after a 1-2 shift.
Change the oil and it was good as new.
Wolfgang, I change my Spyder oil annually and rarely get even 3,000 miles on it. The assays look good but have a little elevated aluminum in them. I’ve been using Rotella 40wt but I switched to 20W-50 this year. We’ll see how that works.