Carburetor needle valve probably leaking while engine is not running causing gas to run down the cylinders into the crankcase.
If engine has fuel pump mounted on the engine then it is leaking gas into crankcase.
Yes, but you risk damaging the engine if there is any significant amount there. The oil should be changed immediately and the problem rectified.
It is a safety feature for the engine I believe so the engine is not damaged.
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).
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.
Engine will loose power, engine sputters or stops running, GAS GAGE SAYS EMPTY
The only way gas would be able to get into the crankcase is when the engine is off, gas is leaking down thru the carb's and passing thru the rings into the oil. Does the engine run well ? Is there always gas in the oil, or did you have trouble starting the engine and flooded it. If it was flooded once, that would do it. Change oil and filter.
Float valve or float are bad , letting carb overflow into crankcase .
Because the carburetor on these motors are no good after a few years. The carburetor will spew large amounts of gas into the crankcase and you do need to change the oil about 3 times after this happens to protect your engine and get all the gas out of your crankcase. The replacement carbs are supposed to be much better than the ones supplied with your engine. A new carb is about $125.00 excluding labor.
An engine's combustion chamber does not have a perfect seal. At the time of ignition, some of the expanding gas leaks past the rings into the bottom (crankcase) of the engine, known as the Blowby Gases. This gas contains oil and partially burned fuel that can pressurize the bottom half of the engine, leading to blown oil seals and making it harder for the engine to work.The Positive Crankcase Ventilation system allows a route for these gases to be scavenged and passed back through the engine for consumption. It reduces emissions and keeps the engine from over pressurizing.
Not knowing what vehicle and engine you have you may have a faulty fuel pump leaking gasoline into the engine crankcase.