I have had my tractor 10 years. On the one that it came with. When it gets hot it weeps oil. BUT water is not leaking in, I think. I never see any water or milky oil in the trans. But it does sit it a carport and rarely in the rain. And if it is I tip the seat tO hopefully keep rain off it. And also if it sits out I try to top the controls and trans.
Carey, I think mine has an O ring on the bottom, was there not one there originally?