Only if you want to ruin your transmission.
yes
Yes, it sure will. Bar oil is not formulated for use in an internal combustion engine and will damage that engine.
Most chain saws have a reservoir that you fill with the bar/chain oil before you start. Check the level every 20-30 minutes while you are working, if you are using the saw constantly. The reservoir must have oil in it at all times while the saw is being used.
Not damage it, but not the best lubrication either.
All you can do is drain the oil out of the lawnmower and replace it with the correct oil.
You do not need oil in order to use electric chain saws. You only need to use lubrication to keep the bar and chain working correctly.
2 stroke oil mix which you mix with a certain amount of gas to get a certain ratio of oil to gas, or bar oil which you need to keep your chain lubed otherwise you create excessive wear on the bar, and chain, and run the risk of getting it stuck in a tree or lock up.
DG makes a good chain lube . If you want to save money get some chain saw bar and chain oil .it has a cling agent in it which makes it stick to the chain . Dump some in a can and use a old paint brush and paint it on the chain .
It refers to the dry weight (no fuel/oil) of the motor/handle assembly without bar or chain attached.
Both are correct, you can say substitute for or substitute with.
Yep. You can run it without the bar and everything. It may leak bar oil though as most pump oil as the motor runs to lube the chain. It may have a tendency to rev higher though so don't squeeze the throttle too much.