Where do you live?When the grass no longer needs regular mowing I switch over to the "as needed " schedule to keep the leaves mulched . I never really stop altogether .
Mid November, is the last cut of the lawn. At that point I winterize the mower and change the oil, so it is stored with clean fresh oil over the winter months. I've been doing this for decades now.
That’s the main reason I’m asking. I’m trying to decide when to change my oil. I think I’m going to start writing this stuff down.