How many kilometers should car gear oil be replaced?

2 Answers
LaylaLee
07/29/25 7:41am
Car gear oil should be replaced every 2 years or 40,000 kilometers. The functions of car gear oil include: lubrication, anti-wear, cooling, heat dissipation, anti-corrosion and anti-rust, cleaning, reducing gear surface impact and noise. Its required properties are: 1. Appropriate viscosity and good viscosity-temperature characteristics; 2. Sufficient extreme pressure anti-wear performance; 3. Good anti-emulsification performance; 4. Excellent oxidation stability and thermal stability. The replacement steps for car gear oil are: 1. Remove the gear, completely drain the old gear oil, and tighten the drain plug; 2. Add new gear oil, ensuring the oil level does not exceed the F line.
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DelCamilla
08/12/25 10:57am
In car maintenance, I learned that the replacement mileage for gear oil varies depending on the vehicle type. Manual transmission models typically recommend a change every 40,000 to 60,000 kilometers, while automatic transmissions may require a change every 50,000 to 80,000 kilometers. The key role of gear oil is to lubricate the internal gears of the transmission, reducing friction and wear, and ensuring smooth gear shifts. If the vehicle operates in dusty environments or frequently undergoes rapid acceleration, the oil may degrade faster. Remember to regularly check the oil level and color—when the oil darkens or contains metal particles, it’s time for a change. Neglecting this can lead to rough shifting or increased noise, and in severe cases, a costly transmission overhaul costing thousands of dollars, far exceeding the expense of an oil change. Developing the habit of following the owner’s manual can save money and extend the vehicle’s lifespan.
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