Only if it is a 2 cycle engine and you mix the oil with the gasoline. If it is a 4 cycle engine, then using 2 cycle oil will destroy the engine over time. Use SAE 10w30 synthetic oil in your air cooled 4 cycle engine.
NO, not as lubrication in the crankcase.
Yes, It will probably smoke due to the extra oil that is burning but will will work in a pinch. Not recommended for extended use.
You can cut down trees with your lawnmower. Warning: Do not actually try to cut down a tree with your lawnmower. More than likely, the gas in the chainsaw is mixed with 2-cycle oil. If your mower also has a 2-cycle engine, nothing will happen. If your mower has a 4-cycle engine, the engine will probably smoke (bluish in color) until the oil is burnt up during combustion. At worst, the oil in the 2-cycle oil/gas mixture will foul up the spark plug and you will probably have to clean it pretty often until the oil is burnt up.
If you have to add oil to the fuel, it is a 2-cycle engine. If you have to add oil through a filler spout into the crankcase, it is a 4-cycle engine.
Only if you want to destroy that engine over time which is what will happen if you use 2 cycle oil. Use only SAE 10w30 synthetic oil any major brand.
No don't use 2 cylce in the crank case. You can use sae 30 or 10-30 but NOT 2 cycle as it is make to mix with gas and go in a gas tank - never in a crank case.
Not really sure what you're getting at. If your lawnmower engine is a 2-stroke then you need a mixture of oil and gas to run it.
Depends on the lawnmower. Some older lawn mowers used two-stroke engines, and you mixed the two-cycle oil with the gas. But 99% of modern lawnmowers use a four-stroke engine with a crankcase. So if the question is: "Can I use two-cycle oil in the crankcase?" the answer is an emphatic NO. It will likely destroy the engine.
Two-cycle lawnmower engines are rare.
what grade of oil on this engine
What kind of engine? lawnmower, car.
Bad things will happen. Mix oil is designed to burn with fuel so it will not lubricate the piston enough and you will sieze the engine.