Consult your user's manual. If you don't have one, you might try checking the Internet URL of the manufacturer of the engine on your push-mower. Most can be expected to use SAE 30 weight oil in a four-cycle engine, and a specific quantity of any reasonable brand of two-cycle oil mixed with the specific quantity … Read more

Many Craftsman push lawnmowers are now equipped with four-cycle engines. It's entirely possible that you have accumulated condensation in the oil, which within any older engine will allow an increasing consumption of oil as the engine operates.  If that oil is laden with water,  it will cause a white exhaust smoke.

Advantage is the availability of almost instant status information for better customer or prospect service. Disadvantage is the cost necessary to create one.

Because its brightness varies on a 30 day cycle.