Kinda-sorta. Prolonged skin contact may cause skin irritation, and drinking it isn't advisable. But an occasional smear of it isn't dangerous
What is the best grade oil for Quad bikes
usually any type of 2stroke air cooled blend... the fuel oil mix for poctet bikes is usually 50:1
no
No
The oil may get on the brakes which you don't want.
valvoline
Bikes can be assembled just about anywhere, but most bikes are put together in Asia - so most bikes are imported.
You could, but it doesn't work very well. It will help collect dirt on the chain, the lubrication qualities are not good and break down faster than an oil made for bikes.
no no
depends chech the owners manual
yes
No, motor oil is toxic (poisonous) to living things.