What kind of oil should be added to the torque converter?

[VonCalvin]

The torque converter should be filled with hydraulic transmission fluid, which is specifically designed for torque converters. The torque converter oil tank has a MAX (maximum oil level) and MIN (minimum oil level) marking. Generally, the oil level should not exceed the maximum mark. The hydraulic torque converter is a hydraulic component consisting of a pump wheel, turbine, and guide wheel. It is installed between the engine and transmission, using hydraulic oil (ATF) as the working medium to transmit torque, alter torque, change speed, and act as a clutch. The hydraulic torque converter is a non-rigid torque converter that uses liquid as the working medium and is one of the forms of hydraulic transmission. The hydraulic torque converter has a sealed working chamber where the fluid circulates, with the pump wheel, turbine, and guide wheel connected to the input shaft, output shaft, and housing, respectively. The torque converter can be connected to the engine via a flexible coupling, preventing the car from stalling under heavy loads. However, the torque converter also has its own weakness, which is the energy transmission loss converted into heat. Therefore, German cars typically use a dual-clutch direct connection. Nowadays, mainstream models like the Nissan Teana are equipped with torque converters, but they use a clutch structure. When the torque converter efficiency reaches above 75%, the clutch engages, directly connecting the transmission to the engine to reduce efficiency loss.

[StWillow]

I work in an auto repair shop, and the most common issue I encounter is owners using the wrong fluids and damaging their transmissions. Torque converters must be filled with automatic transmission fluid (ATF) specifically designed for the vehicle—different cars require completely different types. Older Toyotas generally use Dexron-III, while newer Volkswagens require manufacturer-approved fluids like G052162A2. Last week, a Camry owner mistakenly added engine oil, causing torque converter slippage, and ended up spending over 8,000 yuan on a major repair. Always check for the ATF mark on the dipstick—never confuse it with manual gear oil or brake fluid, as their colors and smells are completely different.

[SawyerRose]

I've driven automatic transmission cars for fifteen years without any torque converter issues, the key is regular fluid changes. The replacement intervals vary greatly between vehicles - for stop-and-go city driving I recommend changing every 40,000 km, while highway-heavy usage can extend to 60,000 km. Always use a flush machine to completely remove old fluid during changes, and older models require simultaneous filter replacement. Beware of those $20 counterfeit fluids online that can clog passages - I strictly use authorized dealership services for peace of mind despite higher costs.

[RoseFitz]

Last time during maintenance, the technician shared a valuable tip: overfilling the transmission fluid is more harmful to the torque converter than using the wrong type. When I check the fluid level myself, I always do it five minutes after turning off a warmed-up engine. I pull out the dipstick, wipe it clean, reinsert it, and then check the level. The ideal fluid level should be slightly below the middle of the marked range. If you notice a burnt smell or the fluid has turned black, it's time to replace it immediately, even if you haven't reached the recommended mileage. Honda owners should pay special attention, as the torque converters in many models are particularly sensitive to fluid temperature.