Why the lawn mower and the exhaust pipe are oiled
Exhaust gas. The piston ring seal to lose the role of the cylinder inside the high-pressure gas to the crankshaft ventilation box leakage, resulting in crankshaft ventilation box pressure is too large and make the oil forced from the exhaust pipe.
Generally three possible. One is because the crankshaft ventilation valve broken, and lose the role of sealing out oil.
Oil plus too much, too much oil, then the crankshaft ventilation box air circulation is not good, forced oil to the exhaust pipe discharge.
