How Many Kilometers Should the Transmission Oil of a Truck Be Replaced?
2 Answers
Truck transmission oil is generally replaced every 80,000 to 100,000 kilometers. The structure and configuration of trucks from different brands vary, so it is advisable to refer to the maintenance manual provided with the vehicle for specific replacement intervals. Relevant information about transmission oil is as follows: 1. If the transmission oil is not replaced for a long time, it will age, increasing the load on the transmission and accelerating its aging, which will affect the service life of the transmission. 2. If the transmission oil is not replaced for an extended period, the oil will deteriorate and age, and the excess heat in the transmission cannot be dissipated through the fluidity of the oil. In severe cases, this can cause the transmission temperature to rise, potentially damaging the transmission components.
In my over ten years of long-haul truck driving, the frequency of changing transmission fluid has been a crucial matter. Generally, it's recommended to change it every 30,000 to 60,000 kilometers, depending on usage intensity. If you frequently haul heavy loads or climb hills, you should advance it to around 20,000 kilometers. I remember once being lazy and delaying it until 80,000 kilometers—the transmission noise became terrifyingly loud, and repairs cost over ten thousand yuan. So now I've developed a habit of regularly checking the fluid color—if it turns dark or black when tested with a dipstick, I change it immediately. Additionally, weather factors play a big role; for example, high temperatures in summer accelerate fluid oxidation and degradation. During routine maintenance, discussing with the mechanic to choose the right type of fluid is also important—don’t cheap out and buy low-quality products. In short, timely changes save hassle and money while extending part lifespan.
