I started parking my tractor in my wood shed and noticed on the concrete a small, quarter size, spot. I crawled under and noticed where the transmission is bolted together there was a droplet of hydro oil. This quarter size spot is over the course of an entire day. It's an L48 tractor. Obviously, the problem is PROBABLY the gasket. However, should I be too concerned about this and tear the entire tractor apart or just accept there is a small leak? Can anything major be affected if I check the oil level regularly?