Cylinder walls, pistons and rings have microscopic roughness prior to operation. During the break-in process, these small irregularities are eliminated. High RPM on a new or overhauled engine can lead to tiny scuff marks that eventually lead to piston failure. Thus, taking into account the service life of the engine, it is advisable not to operate the engine at high speeds for the first 1000-1500 km.
Use the following guidelines when breaking in your vehicle:
- Smoothly change the speed of movement (and with it the frequency of rotation of the crankshaft), so that the moving parts fit well together.
- Do not exceed the permissible speed when running the engine in different gears.
- It is better to change gears more often than to exceed the recommended rpm for each speed.
- On a country road, the engine behaves best during break-in. Over the next 500 km, you can gradually increase the engine speed.
- Starting from a run of 1000 km and up to 1500 km, the engine speed can sometimes be slightly exceeded. Experienced drivers use roads with slopes for this. Under these conditions, you can increase the engine speed without overloading it. Pay attention to the fact that the engine is well warmed up, that is, the car must drive at least 25 km before this.
- The car must travel about 3000 km (diesel = 6000 km), before it finishes running. With a predominantly urban driving mode, the running-in should continue even longer.