If it is a 4-cycle engine you definitely need motor oil. If its a 2-cycle engine then the oil is mixed with the gas. If its a reel mower then no oil is needed except for external lubrication.
Depending on the engine manufacturer the 4-cycle engines will require either SAE30 or 10w30 motor oil.
That depends. Is a manual push mower with no motor, or a motorized one? Oil is usually rated by viscosity and I would use a single viscosity oil in a mower. Multiviscosity oils have modifiers to keep them fluid under cold conditions (in a car engine) but still thick when hot. In a mower a 30w oil would be ideal. Use the cheapest oil (in the long run): Amsoil synthetic.
regular 10w 30 motor oil
No, you should not use bar and chain oil as a substitute for motor oil in a lawn mower. Bar and chain oil is specifically formulated for use in chainsaws and is designed to adhere to metal surfaces under high pressure and temperature, while motor oil is formulated to lubricate engines. Using the wrong type of oil can lead to improper lubrication, increased wear, and potential engine damage. Always refer to your lawn mower's manual for the recommended oil type.
If its got a oil plug its a 4 cycle, 5w-30 motor oil
Yes, that is the correct weight.
Whenever you purchase a push mower you have to realize that it needs a higher grade oil. You should use a higher standard type of oil.
Should probably use 10 w 30 or 30 w.
No.
You can use straight 30 weight oil or 10w30. I recommend synthetic for an air cooled engine.
Yes, it is a premium oil that can be used in any internal combustion motor.
Several things can happen: 1) If using frenchfry oil, wildlife will be attracted to your machine. 2) Oil of Olay will make your hands soft and desirable come oil change time. or 3)It being "wrong", implies not being a good lubricant for the motor which will mean destruction of the motor due to internal wear and heat buildup.
2 quarts <><><><> Depends entirely on the mower. A small (4 or 5 hp) push mower uses about 20 US ounces- less than a quart. My 15 hp riding mower uses 1.5 quarts.