How often should the gear oil in a sedan be replaced?

[Gene]

Sedans should have their gear oil replaced every 2 years or 40,000 kilometers. The functions of gear oil include: lubrication, anti-wear, cooling, heat dissipation, anti-corrosion and rust prevention, cleaning, and reducing gear surface impact and noise. Its key properties are: 1. Appropriate viscosity and good viscosity-temperature characteristics; 2. Sufficient extreme pressure anti-wear performance; 3. Good anti-emulsification properties; 4. Excellent oxidation stability and thermal stability. The steps for replacing gear oil are: 1. Remove the gear, drain the old gear oil completely, and tighten the drain plug; 2. Add new gear oil, ensuring the oil level does not exceed the F line. Gear oil, also known as transmission lubricating oil, is primarily made from antioxidants, anti-foaming agents, and rust inhibitors.