Just drain the incorrect oil and re-fill with the correct oil. There shouldn't be any damage unless you ran it for an extended period of time.
If the wrong oil is used in a lawnmower, do not start it. Simply drain the oil as completely as possible and fill with the proper oil.
to put the oil in the lawnmower's crankcase would be fine, so long as it is an appropriate viscosity.
SAE 10w30 weight synthetic oil.
0.6 litres
Drain the oil and gas out of the crankcase and put oil back it should be OK
You get engine damage from lack of lubrication
Drain the oil and catch it in a clean container if you intend on reusing the same oil . Then replace the plug and place the correct amount of oil in the motor.
The engine floods and you have to wait for the lawnmower to drain before you start it up again or it might start smoking.
Yes 10w30 is a good oil for snowblower or lawnmower.
Apparently you didn't crank it up. You are still here. Nothing except it may clean out some old dirty oil. Remove the gas and the oil and discard same. Refill the oil section and refill the gas tank. Don't do that again.
Most small engines use 30 weight non-detergent type.
Yitou can. But its not recommended. It wont run right. Stick with the manufacturers recommended weight.