The pistons seize up and your engine is shot. Found that out the hard way when I was 16 lol ALWAYSSS make sure you have oil in the car cause that little read check engine light is serious about oil.
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
the motor gets lubricated.
Your cars motor will explode.
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.
Oil leakage and loss of compression and power loss.
The viscosity of the oil may not be heavy enough to protect the engine.
no big dea. just dump the oil and refill to the required amount