Yes, but you risk damaging the engine if there is any significant amount there. The oil should be changed immediately and the problem rectified.
to put the oil in the lawnmower's crankcase would be fine, so long as it is an appropriate viscosity.
Crankcase oil, gas needs to be premixed
Drain the oil and gas out of the crankcase and put oil back it should be OK
no, the oil is mixed with the gas before it goes in the carb, so there should never be oil sitting in the crankcase.
This is caused by the needle and seat not closing off the flow of fuel. The gas gets into the cylinder, fills it up, and when you turn the engine over it compresses the gas. This forces the gas to work its way around the end gaps in the rings and into the crankcase (and oil).
crankcase oil is the oil in the engine .some call it crankcase oil some call it engine oil
Typically this is caused by a dirty carburetor causing gas to leak through and into the crankcase.
Could be a serious problem. Most likely a bad piston ring allowing gas to slip by the piston and cylinder wall, and mixing with the oil in the crankcase. --- It would depend on the car. It could also be sticking injectors.
A four cycle engine does not use a gas/oil mixture. The oil is in the crankcase and the gas goes in the gas tank. If you put oil in the gas on a 4 cycle engine it will run poorly and smoke a lot.
If engine has fuel pump mounted on the engine then it is leaking gas into crankcase.
none 2 cycle engines run a gas/oil mix for lubrication
generally in a lawnmower you use straight gas. there should be oil in the crankcase for engine lubrication. check the owners manual for proper oil weight