The oil level on the dipstick said I needed to add oil. I added oil to the fill line. When I started the lawn mower, however, it started blowing out white smoke. I don't know if I misread the dipstick or what but apparently the oil is too full. I turned off the lawn mower immediately after seeing the smoke. Have I already done the damage? What can I do to fix it? Drain the oil out and how? Please Help!!