The generator should have come with an owner's manual that lists the type of oil. Also, the oil refill may list the oil weight to use.
4 stroke oil
4 stroke
special 2-stroke oil.
10W30 engine oil
Two stroke Oil. Penzoil makes a good one
Best to use two stroke oil. Mix it with the petrol, (I guess you know this)
just 2-stroke oil can get it at fix up stores, many places have it
This is a small two-stroke scooter with oil injection. It uses a two-stroke oil and you can buy this from your nearest Honda motorcycle dealership, or use any other acknowledged two-stroke oil.
The Yamaha EF 600 generator has a four stroke engine and uses gasoline with no oil added to the fuel. It will run for about six hours on one fill of the gas tank, about 0.5 gallon (US).
standard 2 stroke oil snowmobile or dirt bike oil
You need to define what your use of the oil will be. If you mean adding oil to the fuel, you do not need to do this on an 4 stroke motor. Or maybe you mean engine oil, or maybe transmission oil?