I recently purchased a used John Deere 300 riding mower. It has a 16 HP Koehler engine. The guy I bought it from said it has alot of hours on it and it leaks oil. I started it and it seems to run fine. The mower itself seems to be in good shape. I paid $500.00 for it. Can anybody advise if this mower has a history for problems. I don't think John Deere makes this model anymore, How come? I will be using it for just my yard, approx 3/4 acre with some moderate slopes. In the future I might look for a snow blade for it. I will be taking it to a JD service store for them to go over it and tune it up. I would appreciate comments from people who know something about this model.