When Should the Car Transmission Fluid Be Changed?
2 Answers
Car transmission fluid should generally be changed every 40,000 kilometers. Transmission fluid is an oil product that keeps the gear system clean, ensuring the normal operation of the transmission and extending the lifespan of the transmission components. Transmission fluid is crucial for the transmission, as it ensures proper functioning and prolongs its service life. Performance indicators of transmission fluid: 1. Appropriate viscosity—automatic transmission fluid operates within a temperature range of -40°C to 170°C, which is quite broad. Automatic transmissions are highly sensitive to the working viscosity of the oil, and different types of transmissions require different viscosity levels. Therefore, the type of transmission fluid should not be changed arbitrarily for automatic vehicles. 2. Good anti-foaming properties—automatic transmissions can produce foam, which can cause significant harm to the transmission system. Foam can reduce the torque converter's power transmission efficiency and, in severe cases, interrupt oil supply. 3. Excellent anti-wear properties—good anti-wear performance is necessary to meet the requirements of planetary gear transmission and clutch plate operation.
I think changing transmission fluid depends on the car and the driver. Generally, based on my experience with automatic transmission cars, I recommend changing it every 40,000 to 60,000 miles, or follow the intervals specified in the owner's manual. Manual transmissions might need more frequent changes, around every 30,000 miles. Driving habits play a big role: if I'm often stuck in city traffic or frequently tow heavy loads, the fluid degrades faster, so I shorten the change interval. Delaying fluid changes can lead to overheating, rough shifting, and expensive repairs. That's why I make it a habit to have the technician check the fluid level and color during annual maintenance—bright red is good, but if it's dark or has a burnt smell, it needs an immediate change. Don’t underestimate this; it affects the car’s lifespan and your peace of mind while driving.
