You're correct,the oil doesn't have to be changed that often as I don't use all of them nearly to that extent. Tires and batteries though, seem to be items that require periodic attention regardless. Its not that I'm swamped with taking care of them, I'm just not one to let things simply sit and deteriorate, so everthing gets started up and driven around periodically to keep oil splashed where it needs to go, tires from sitting too long and batteries charged. It never fails though, the implement or tractor that I DO want to use, has developed an air leak in a tire or the points are tarnished, or the battery is low. I suppose I could block everything up for the tires sake, but that is an incredible pita for things you do actually use. They're not in a museum so that is impractical. There always seems to be SOMETHING that needs to be addressed. Last night, I took apart an ammeter that quit working, to find a tiny metal shard stuck to the magnet. Then I had to clean the points on a '49 cub and finally I disassembled and cleaned the right brake on a '36 B that was sticking. Sitting, NOT working, is harder on some things than a daily workout. I really like going out to use a tractor and having no issues to contend with other than putting fuel in it. The whole fuel thing is another issue. I don't dare let fuel sit in a tank anymore, so everything is dry, so to start it up, I drag a fuel can with me. After running it a while, I drain it again. I INTEND to get back and start it before too long, but I also konw things happen... and if you don't run it, the bad gas causes all kinds of problems. For those who aren't terribly concerned with taking good care of their stuff, its not an issue. I on the other hand, spent too many hours restoring this stuff to allow it to decay from neglect. My whole point is that I have been, and still am,limiting and/or diminishing my collection.. I just can't understand how anyone with 50 or 100 tractors does it, unless they are drained, blocked,batteries removed and rarely if ever used. I don't think I'd enjoy a collection of tractors I couldn't drive.