2019 manual also says 40 hours. Not sure why I settled on 20 hours but the oil is black and there is a build up on the magnet of the drain plug.Why?
2020 User Manual says every 40 hours - and we all know the manual is written for race performance. So I could probably go more, but I'll do the 40 hours. But 20 sounds like overkill unless your 2019 has a different story in the manual?