Operation of a new car starts with run-in. Any engaging parts, regardless form the type of technology used during manufacturing, need to be adjusted or ground (run-in). Further longevity of the car largely depends on the thoroughness of the run-in period. To ignore this fact means make the engine with a large number of high-precision movable elements operate with increased loads outside the range of its most efficiency, which can result in decrease of service life expectancy, increases consumption of fuel, oil etc.