It has emulsified. Become contaminated.
If the engine has an oil filler cap and an oil sump, it is a four-stroke engine. The oil goes in the sump and the gasoline in the gas tank. If there is no oil filler cap or oil sump, the engine is a two-stroke and the oil and gas need to be mixed before adding.
If it is a 2-stroke engine, the oil/gas mixture has too much oil. If it is a 4-stroke engine, the oil sump is overfull.
Four stroke engines use an oil sump, and do not need to have oil mixed into their fuel.
if your scooter has a engine oil dip stick then it is a four stroke. if it has a oil tank that you have to put oil in then it is 2 stroke.
Yes you can, as a mater of fact that is what is done in two stroke engines that dont have a sump.
on the same side as the starter motor on the sump pan
They will run (poorly) on it. Four stroke engines have a sump to hold the oil so none is needed in the fuel
no
There is no difference in 4 stroke and 2 stroke oil, except that 2 stroke uses non-detergent oil. 2 stroke oil is actually 30 weight non-detergent (30wt ND) oil. Oil with detergents will leave deposits in 2 stroke cylinders, and is not recommended.
The sump is the oil reservoir. An oil pump lifts the oil from the sump and forces it under pressure through the engine. The oil then returns to the sump to be used again. Some sumps have fins on then - this acts as a cooler to help cool the oil in the sump.
With a 2 stroke engine, you mix the oil with the gas. With a 4 stroke engine, there are separate tanks for the oil, and the gas.
4 stroke fuel is straight petrol, it does not have oil in it! If you use it in a 2 stroke engine you will seize the motor. 2 stroke fuel has oil added to it.