Does the Transmission Filter Need to Be Replaced?
4 Answers
The transmission filter needs to be replaced, typically when the transmission fluid is changed. Common types of automatic transmission filters include those for dual-clutch transmissions (DCT), automatic transmissions (AT), and continuously variable transmissions (CVT). Here is a brief introduction to the three types of transmissions: (1) Dual-clutch transmissions (DCT) are currently very popular due to their fast gear-shifting speed and high transmission efficiency. The structure of a DCT is similar to that of a manual transmission, but it features two sets of clutches—one for odd-numbered gears and the other for even-numbered gears. (2) Automatic transmissions (AT) are the most widely used, technologically mature, and have the highest production and R&D costs. They offer excellent gear-shifting smoothness and durability. (3) Continuously variable transmissions (CVT) have a simple structure, compact size, and lightweight design. Their production cost is relatively low, making them a common choice for many affordable family cars.
Last time I took my automatic transmission car for maintenance, the technician specifically checked the transmission filter. He said this thing is like a mask for the transmission, blocking metal shavings and sludge. Automatic transmission cars usually need it replaced every 40,000-60,000 km, while manual transmissions can last longer. If the filter gets completely clogged and oil flow is restricted, the transmission will grind dry like a fish out of water. I've seen cases where people didn't change the filter, and eventually the whole transmission started making loud rattling noises - the repair costs could reach half the car's value. Now I always follow the maintenance manual for regular checks, and it's most cost-effective to replace the filter during oil changes. When driving normally, try to avoid constantly hauling heavy loads - keeping the transmission load light can extend the filter's lifespan.
Having repaired cars for over a decade, I've seen countless troubles caused by not changing transmission filters. Especially in older American cars, where the filter location is cunningly designed—owners skip it for convenience, only to find the oil pan full of metal shavings. If newly replaced transmission oil turns black after just 2,000 kilometers, it's a sure sign the filter is clogged. Modern cars come with maintenance schedules, but actual needs depend on driving habits. Vehicles frequently driven on construction sites should have their filters changed every 30,000 km; city commuters can stretch to 80,000 km. Here's a down-to-earth check method: inspect the oil pan magnet during oil changes—if it's collected metal debris the size of a fingernail, the filter is basically done for.
The transmission filter is like a fuse, a mere few dozen bucks can prevent tens of thousands in transmission damage. It's a must-change for automatics, while manuals depend on the model. A Didi driver I met last time said he changed the filter five times over 300,000 kilometers, each time included in the maintenance package, costing an extra 200 yuan per change. If you wait until the transmission starts making strange noises to fix it, the disassembly fee alone could cover five filter replacements. Always opt for OEM filters—aftermarket ones often have non-standard mesh holes, letting small debris pass through and damage transmission gears. The most hassle-free approach is changing both the fluid and filter regularly.
