Is CVT Transmission Fluid Lifetime-Free?
3 Answers
It needs to be replaced, usually every 80,000 to 100,000 kilometers. There is no unified standard for this. It is recommended to check it every one or two years to see if there are any issues. During the inspection, check the quality of the fluid and whether the fluid level is normal. If there are any adverse signs, it should be replaced. Below is more information about CVT transmissions: 1. The lifespan of a CVT transmission depends on driving habits, as well as the vehicle's load and horsepower. Frequent hard acceleration and sudden braking may accelerate the wear of the CVT transmission's steel belt. 2. In theory, CVT transmission fluid does not need to be replaced, but if the usage environment is harsh or the vehicle is very old, it is necessary to perform data communication with the transmission control unit using a diagnostic tool to check whether the internal recorded data has reached 210,000 kilometers. If it exceeds 210,000 kilometers, it can be replaced, but only specialized original transmission fluid should be used.
My car has a CVT transmission and has been running for six or seven years. I remember the salesperson saying the fluid was maintenance-free for life when I bought it, but I always felt uneasy. After driving about 80,000 kilometers, the car started to feel sluggish when accelerating, sometimes making a clunking noise, so I immediately took it to a repair shop for inspection. The mechanic said the fluid had turned black with metal shavings, and after replacing it, the car ran much smoother. Later, I checked the manual and found that although it stated 'maintenance-free for life,' under severe conditions like city traffic congestion or high temperatures, the fluid degrades faster, and it’s recommended to change it every 60,000 to 80,000 kilometers. If not replaced, long-term wear could damage transmission components, leading to higher repair costs. Now, I change the fluid every five years or 50,000 kilometers—it doesn’t cost much but gives me peace of mind.
As a car enthusiast who loves to delve into details, I've researched why CVT transmission fluid must be changed. Unlike traditional transmissions that only require lubrication, CVTs rely on the fluid to clamp the steel belt or chain. If the fluid deteriorates, it can easily cause slippage and failure. I've tested fluid samples from older cars—cloudy with particles—indicating oxidation from heat and friction, which reduces viscosity and affects shifting performance. Manufacturers generally recommend changing it every 40,000 to 100,000 km, depending on the vehicle and driving habits. For example, frequent short trips dirty the fluid faster. Neglecting this can lead to overheating, accelerated wear, and even fire risks. From repair manuals and forums, I've learned that regular fluid changes are key to protecting the transmission.
