What are the maintenance items for a vehicle at 20,000 kilometers?

[Nellie]

There are 4 maintenance items for a vehicle at 20,000 kilometers: 1. Replace the engine oil and oil filter. This is a mandatory item for every maintenance service. Since engine oil deteriorates significantly under high temperature and high pressure conditions inside the engine, its performance declines substantially over time, failing to protect the engine. The oil filter serves to remove impurities and protect the engine, so both the oil and oil filter should be replaced simultaneously. 2. Inspect the air filter. The air filter reduces the intake of air containing particulate matter, thereby minimizing wear and damage. During the 20,000-kilometer maintenance, check if the air filter is dirty. If it is excessively dirty, replace it; otherwise, simply clean it with an air gun. 3. Inspect the spark plugs. Spark plugs in gasoline engines introduce high-voltage current into the cylinders to create sparks that ignite the air-fuel mixture. Replace spark plugs if you notice a decrease in engine power. The lifespan of spark plugs varies by material: iridium spark plugs should be replaced every 80,000–100,000 kilometers, platinum spark plugs every 50,000–60,000 kilometers, and nickel spark plugs every 20,000–30,000 kilometers. 4. Check the brake pads. During the 20,000-kilometer maintenance, inspect the thickness of the brake pads. If they are excessively worn, replace them to ensure driving safety.