TM 11-6615-241-35-1-2 Planned Maintenance and Lubrication Engine Oil Level Check Check the engine oil level at left side of engine.  Pull the dipstick out, wipe it with a clean wiper, and push it back into the dipstick tube.  Remove the dipstick again and check the oil level. Engine Oil and Filter Change It is recommended to: * * Drain and replace the engine crankcase oil every 50 to 250 operating hours. * Replace the engine oil filter every oil change. * NOTE The time interval for changing engine oil will depend upon your application and operating conditions. Engine Air Cleaner Change the engine air filter element every 50 to 250 operating hours, depending upon your application and operating conditions. E-98