I was hoping someone could help me with some problems. I just bought a used Zen Noh L1500D. I have never owned a tractor before and don't know much about them. I was trying to refuel it with diesel and noticed a plastic sleeve in the fuel tank. Do I add oil to the diesel fuel before refueling like a weedeater? Also, I was wondering if anyone knows where I can get a manual for this tractor? The guy I bought it from did'nt have any of the owners manuals or paperwork. I sure would appreciate any help. Thanks. email me at galvinm@eezznet.com