What maintenance schedule should I follow for the Craftsman M220?

Before each use, check the engine oil level and mower lines. Every 25 hours of operation, check the mower head engagement, perform engine/machine cleaning, check nuts and bolts, check the spark plug, change the engine oil, service the air filter, and lubricate the jackshaft assembly and wheel bearings. The engine oil should be changed more frequently if used in extremely dusty or dirty conditions.