I'm trying to solve a problem on my my Moms 3 year old Briggs & Stratton, 6.25 190 cc mower, it's smoking and oil in the air filter,. The oil looks thin and after running it the dip stick is covered in thin gray oil,. Some say it's a carb problem, some say it's a blown head gasket,. Anyway to tell,. Or test the 2 differences,.

Smell the oil see if it smells like gas.
Probably needle in carb or dirt in carb , allowing fuel to run into the engine.
Luck

Wow,. cool,. maybe I'll just check the carb out completely, rebuild it with a kit and try that,.