Question: how do you know if you put too much oil in your car?
Answer: Dipstick reading. Warm the engine by driving the car a few miles. ... 
White Exhaust Smoke. If thick, white smoke comes out the exhaust pipe, this can be an indication that there is too much oil in the engine. ... 
Leaking Oil. Residual oil can leak from the engine, and end up on the floor beneath the vehicle.