What are the major maintenance items for a vehicle at 40,000 kilometers?

[DiSavannah]

The major maintenance items for a vehicle at 40,000 kilometers are as follows: 1. Spark plugs. It is recommended to replace them every 40,000 kilometers. After 40,000 kilometers, the ignition efficiency of spark plugs generally decreases, which can increase fuel consumption, cause carbon buildup, and reduce power. It also increases the risk of damage to the oxygen sensor and catalytic converter. 2. Fuel filter. Most vehicle fuel filters are located outside the fuel tank. Since gasoline contains impurities, it is advisable to replace the fuel filter every 40,000 kilometers. Do not wait until the filter is clogged, causing the vehicle to stall and leave you stranded on the road, before thinking about replacement. 3. Coolant. Coolant has anti-freeze, anti-corrosion, and anti-boil functions. Generally, its effective period is three years. If you have driven 60,000 kilometers within three years, it is recommended to replace the coolant. Expired coolant can corrode the engine's water channels, water pump, and radiator. 4. Transmission fluid. For newer Nissan models, except for CVT and manual transmissions, it is recommended to replace the transmission fluid and transmission filter at 40,000 kilometers. 5. Brake fluid and power steering fluid. Brake fluid is hygroscopic and can easily form vapor locks under special conditions, leading to reduced braking efficiency. Its effective period is two years. If you have driven 40,000 kilometers within two years, it must be replaced. A few older Nissan models with power steering pumps require power steering fluid replacement. Newer Nissan models use electronic steering systems. 6. Cabin air filter. When there is an unpleasant odor from the air conditioning vents, it is time to replace the cabin air filter. At 40,000 kilometers, the cabin air filter should be replaced as well. If possible, check the cabin air filter for dirt and clogging during every minor maintenance and replace it promptly if necessary.