What goes with a car, comes with a car, is no use to a car, but the car can't move without it?

Question

A man wants to buy a used car. He finds a beautiful Buick for $9500, but he buys it without paying a dime.

How did he manage this?

Answer 1

Noise
The engine is usually the main culprit, but even electric cars make some noise from the tires on the road.