My wife left our sovereign mower on its side for too long...and it was pouring out white smoke, and oil dripping out of the side of the exhaust. The smoke is scary, but unless mower is very old theres highly unlikely to be anything serious wrong with it.
What I did was to put the mower running, handles tied together so it runs, white smoke pouring out , somewhere isolated and stand a very long way off and wait....and eventually, the smoke clears slowly and now its all gone. Simples. Dont let the smoke scare you is the answer. Tough it out.Just oil got into the wrong parts...burn it off.
Austen Pinkerton
June 2015