(1) Different operating techniques and measures. Maintenance is based on planned prevention, usually mandatory operations. Repairs are operations that are carried out as planned and needed.
(2) The operation time is different. Maintenance is usually performed before the vehicle breaks down. Repairs are usually performed after the vehicle breaks down.
(3) The purpose of the operation is different. Maintenance is usually to reduce the wear rate of parts, prevent failures, and extend the service life of the car; while repairing parts and assemblies that fail or lose their working ability, restore the car's good technical condition, working ability and extend the service life.