Why does the oil pan of the Smart 453 make a humming sound?

How many liters of transmission oil does a Smart 4-door need for a change? Do I need to remove the oil pan and replace the filter?

Why does the car make a humming noise at 40 mph? The noise is very loud, and the shock absorbers have been replaced.

Does anyone else with a Smart 453 have a gasoline smell inside the car? [what]

Is anyone else having the same issue with the trunk of the Smart Fortwo Cabrio 453 not opening?

Looking for rear brake pads for Smart 453.

Do I need to remove the oil pan to change the oil?

What is the size of the rear wiper for the Smart 453?

How to solve the safety belt issue in the Smart 453?

How many kilometers should the brake pads be replaced on a Smart 453?

Does your 5-door Artist make a slight humming sound from the rear seats after ignition?