Nothing bad will happen unless you swallow it. Just spit it out and rinse out your mouth. Know that used motor oil contains many cancer causing agents.
No oil filter, no oil, lots of damage.
The engine Burn out
Circulating water will not be sufficient and the car will overheat.
it will burn into pieces
Your cars motor will explode.
the motor gets lubricated.
CREATES A MESS, and gives you a false reading of oil level
Your car stops moving.
To a car? It overflows and the junk gets everywhere.
no big dea. just dump the oil and refill to the required amount
your car overheats. Your oil is not going through the cylinders creating lots of heat
The viscosity of the oil may not be heavy enough to protect the engine.