At how many kilometers should the secondary maintenance of a car be performed?

[ValerieAnn]

Secondary maintenance is a maintenance operation centered on inspection and adjustment for motor vehicles that have traveled a certain mileage. The mileage at which secondary maintenance should be performed varies among different brands and models, and the specific interval should be determined according to the maintenance manual of the particular vehicle model. The purpose of secondary maintenance is to maintain the good working performance of various components, mechanisms, and assemblies of the vehicle, ensuring their normal operation between two secondary maintenance sessions. The main content includes the following aspects: 1. Engine section: Inspect cylinder pressure or vacuum, clean carbon deposits in the combustion chamber and grind valves if necessary, adjust valve clearance, and check for oil leaks from oil seals and the rear bearing of the crankshaft. 2. Clutch and transmission section: Check the effectiveness of the clutch and the bolts of the bottom cover, adjust the free travel of the pedal, and apply grease to the pedal shaft.