Very bad.
Yes, never put oil formulated for a diesel in a gasoline engine.
your oil sending unit is bad
where do you put transmission oil in a standard car?
Put more oil in it.
If you wait to long to change your oil you can hurt your car. What excatly is a Bad oil change?
what kind of hyderlic oil i have to put in jack
Yes, a person can put to much oil in a car. It usually will not hurt a car, but the excess oil can cause smoking if it gets on the motor.
The oil from a car is bad for your health.
Depends on what you mean by "bad." If its bad as in low quality oil/filter it the long run it can damage your engine and in the short run give you less gas mileage. If its bad as in a idiot technician didnt tighten the filter or put the wrong oil, or not enough oil. Yes that can be very bad for your engine and damage performance.
No.
in a car
yes