So my neighbor comes over to ask if my son would mow her lawn for $10, because her mower quit. Her husband went to Iraq, for a year(cilvilian-fireman) and wont be back to Jan. I said I would take a look at it to see if it was something simple. It was locked up, the pull cord would not come out at all. I checked the oil, there was none, not only low, but dry, just gray graphite sludge that stained your skin. She said it usually works , but it stops and the cord wont pull sometimes after awhile it does and starts, but it wont this time. I told her it is probably toast and explained it ran out of oil, she said she was going to throw it away and I could have it, she will buy another one, it was about 5 years old anyway. I pulled it over to the garage and thought I gotta check this out the air cleaner was totally toast, it was ruptured, carb was half full of black fine dirt/grass mixed. I took it off and cleaned it. I used a wood block and pounding on the blade, got the motor to turn over. I refilled the engine with MMO and 15w40-50/50 mix. and the thing would pull and turn over. I couldnt get it to start. I gave it a shot of ether and it fired up, smoked like crazy, then cleared out. I changed the oil two more times and flushed it once to get the gray sludge out. It still wont start without "aide-ether" but it does start and sounds good. Bad thing is though her son, 16, messed with the throttle and has the governor hookup screwed up and I think its running too fast. I really just wanted it for parts, so I dont think I would ever use it. I would give it back, now that it is running, but I know she would never get it running anyway plus I really dont know how safe it is. The son likes the $10 to mow her lawn, and it really is a good deal, the lawn service charges $30. Interesting though, those Briggs never cease to amaze me. I just wanted to share this story, by the way, she told me her husband never changed oil in this mower and they never checked it. Cool, just cool.