How often should large vehicles be serviced?

[Phoebe]

Large vehicles generally require their first service at around 5,000 kilometers. The engine oil should be changed every 5,000 kilometers. During the oil change, it's recommended to replace all three filters simultaneously, while the gear oil should be replaced every 20,000 kilometers. Wheel maintenance should be performed every six months. For long-distance trucks or dump trucks, monthly servicing is advised, with brake adjustments required every half month. Additional Information: 1. Tire specifications vary - for 1200-20 tires, inflate to fourteen and a half units of pressure, but this applies only to radial tires. ABS systems should be cleaned and serviced if they respond too early or too slowly. 2. Remove harmful sludge and varnish deposits from the system, eliminate risks of malfunction under extreme temperatures, effectively prevent brake fluid deterioration, and completely replace old brake fluid.