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With a typical mower engine, detergent oils are the way to go. Usually non-detergent oils are for special applications such as air compressor pumps, which specifically call for non-detergent oils. Check you engine, if it is an overhead valve (OHV), then you will want to use a multi-viscosity oil (5W-30), but if it is not, then use the straight 30W.
SAE 30WT i.e non detergent. Change oil every 25 hours and every 4th oil change us a detergent 30 WT oil.
The manuals will never tell you that but having worked on small engines since the mid 60's that 4th oil change with a detergent oil does a bang up job of keeping the oil ring from eventually cooking onto the piston. Also washes out the crank case and makes it look like new!
Lawn mowers with engines smaller than 10 hp use a "splash" oil system for lubrication. Therefore you should use a standard SAE 30W non detergent oil. Per most user's manuals oil changes are every 25 hours of use. Every 4th oil change you can use a detergent 30W oil. Doing this will clean the inside of the crankcase and all components to the point the look brand new. It will not hurt the motor or the seals in the motor. However after this cleaning 25 hour period with the detergent oil, you should go back to SAE 30W oil again.
Simplest thing to do. Remove spark plug wire for safety. Remove oil filler plug. Tip mower to the side the filler neck is on with a bowl waiting on the ground next to the mower to catch the used oil. When empty, tip mower back upright and refill with 20 oz of 30 weight non-detergent oil. Put filler cap back in and check level. Replace spark plug wire. Thats it!