What Happens If Transmission Fluid Is Not Changed for a Long Time?
2 Answers
If transmission fluid is not changed for a long time, the following situations may occur: 1. If automatic transmission fluid is not replaced for an extended period, it will become thicker, which can easily block the transmission cooler. Teng Hua Transmission Repair reminds that this may lead to excessively high transmission fluid temperature, potentially causing issues such as gear shift shock, and may even damage the automatic transmission. 2. Failure to change automatic transmission fluid for a long time can also lead to fluid deterioration and reduced viscosity, causing fluid particles to enlarge or generate debris that blocks the oil passages. This may result in minor slipping of the vehicle's automatic transmission clutch or brake. 3. Automatic transmission fluid serves to lubricate various components. If it loses its effectiveness due to prolonged use, the lack of a protective layer between parts will lead to direct friction, thereby accelerating the wear of mechanical components. In severe cases, it may damage elements such as the automatic transmission planetary gear set or differential.
When I was younger, I drove an old car and didn’t change the transmission oil on time. As a result, shifting gears became extremely jerky, almost like being dragged. Over time, it happened several times, and after starting the car, the transmission made creaking noises. When I took it to the repair shop, the oil had turned completely black, filled with metal shavings, and the gears were severely worn. In the end, I had to do a major overhaul, which cost me tens of thousands. The mechanic said that when the oil deteriorates, lubrication becomes insufficient, temperatures rise, and components grind dry, leading to such issues. Now, I change the oil regularly, every 40,000 to 50,000 kilometers, to avoid major problems. Paying a little more attention in daily maintenance can save a lot of trouble and money, making driving much more worry-free.
