I would keep all my machines in the house if I had room. I just don't. This place is not big enough.
I've never put oil or any other leather conditioner on treadle belts. Might be an idea to try.
I got a new belt, well my wife did, tonight and will get it put on tomorrow. The price has gone up at the LSMG shop. It's now $12.99 + tx. Last one I bought was around $7.00 or so. I'll have to lay in either a roll like Tink's Mom said, ( if I knew where to find it ) or get some from Sew-Classic next time I order. Theirs is cheaper.
The new belt is an Alpha-Sew product and much nicer than the old belt. Bigger diameter, smoother leather (the old one is scaly like a fish), and more supple.
I think it will work better too.
Joe