What Stage is a 150,000 km Engine In?

[VonLondyn]

An engine with 150,000 kilometers of mileage is in the natural wear stage. Engine stages can be divided into the following three scenarios: New engine (or overhauled engine) break-in wear stage: During this period, due to the initial surface roughness of newly fitted components, wear occurs relatively quickly, commonly referred to as break-in wear. Natural wear stage: After the break-in period, the wear rate slows down, the wear amount stabilizes, and it increases uniformly over a long period. This phase is called the normal working period, and the wear during this time is termed natural wear. Catastrophic wear stage: Once the natural wear reaches the wear limit point, the increased clearance prevents the oil film from being maintained, lubrication conditions deteriorate, impacts begin to occur, and wear accelerates sharply. The components quickly lose their working capability until failure. This period is known as the repair interval or repair period for fitted components, also referred to as the catastrophic wear stage.