It depends on what kind of chainsaw it is. I have many different types of stihl brand chainsaws and there is not a spot for "typical engine oil" like in your car. These machines are 2 stroke engines and require you to mix the oil with the gas. The oil can be picked up @ any Home Depot or lowes or really any hardware store. Don't feel dumb asking questions at these stores. It will save you alot of money to ask questions.
Electric chainsaws do not use gas !! They do however use oil on the chain.
20w 50
engine oil
Can am ds90 oil type
premium engine oil
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10w30 Your oil cap on the engine block will have it printed.
5W30 oil.
What kind of engine? lawnmower, car.
Chainsaws use a mixture of 80% petrol and 20% 2-stroke oil. You can buy it already mixed, or (more commonly) mix it yourself.
50:1 with an appropriate oil.