Should Manual Transmission Fluid Be Changed?

[DelRosalie]

Yes, the transmission fluid can be changed, but it should not be done lightly. Below is relevant information: 1. Manual transmission fluid, also known as gear oil, is classified into five grades: GL-1 to GL-5. GL-1 to GL-3 have lower performance requirements and are used for general lubrication. GL-4 is used for lubrication under conditions of high speed with low torque and low speed with high torque. 2. GL-5 offers the best performance and is used for lubrication in transmissions under harsh operating conditions with high impact loads. It is important to note that transmission fluids should not be mixed. Some automatic transmission fluids cannot be used in continuously variable transmissions (CVT) or dual-clutch transmissions (DCT), and must be matched with the appropriate transmission fluid. 3. For manual transmission vehicles, due to the mature technology of the transmission, high reliability, and low failure rate, the fluid is generally changed once every 3 years or after driving 60,000 to 80,000 kilometers. The replacement interval is slightly longer compared to automatic transmissions.

[VonClara]

Manual transmission fluid does need to be replaced, though not as frequently as automatic transmission fluid. Neglecting it can lead to major issues. I drive an older manual transmission car, and after prolonged use, I noticed some stiffness when shifting gears and increased noise. Later, after consulting a friend, I learned that the transmission fluid had become too dirty, reducing its lubricating effectiveness and accelerating gear wear. Generally, the replacement interval is every 30,000 to 60,000 kilometers, but it's best to follow the manufacturer's recommendations. Checking it is simple: after parking, you can inspect the fluid color through the oil level hole. If it's too dark or murky, it's time for a change. Don't underestimate this expense—a few hundred yuan spent now can prevent a complete transmission failure.

[DiCayden]

As someone who frequently helps friends with car inspections, I must remind you that manual transmission fluid must be changed, otherwise the repair costs later will be much higher. Its primary function is to lubricate gears and bearings, reducing friction and heat buildup. Over time, the fluid thickens, decreasing lubrication efficiency, which can lead to rough shifting and even increased engine load. I recommend changing it every two years or 40,000 kilometers using specialized manual transmission fluid—avoid generic types. Also, check the seals and filter screens to ensure there are no leaks. Regular maintenance extends your vehicle's lifespan and ensures smoother driving. The cost is only around one or two thousand, which is far better than spending tens of thousands on repairs when a failure occurs.

[FranciscoMarie]

Changing manual transmission fluid is crucial for driving safety. Deteriorated fluid can cause rough or failed gear shifts, increasing the risk of accidents during highway driving or on slopes. I've seen numerous cases where neglected maintenance led to transmission lock-up, resulting in costly repairs and vehicle downtime. Adhering to a 30,000-50,000 km fluid change interval maintains optimal performance. Using genuine fluid is key—never compromise quality to save money. A simple fluid level check can reveal issues early, preventing major headaches down the road.