How many kilometers should a car's gear oil be changed?

[VonElaina]

Car gear oil replacement cycle: The gear oil of a manual transmission should be replaced every 100,000 kilometers, while the gear oil of an automatic transmission should be replaced every 60,000 to 80,000 kilometers. Some rear-wheel-drive cars also require separate replacement of the rear differential gear oil. The replacement cycle for this gear oil varies for each vehicle. For general household rear-wheel-drive cars, it can be replaced together with the transmission oil. For high-performance rear-wheel-drive cars, it needs to be replaced every 40,000 to 50,000 kilometers. The gear oil in a manual transmission serves the functions of lubrication and heat dissipation, while the gear oil in an automatic transmission serves the functions of lubrication, heat dissipation, and power transmission.