How Durable is the BYD 6-Speed Wet Dual Clutch Transmission?
2 Answers
BYD's 6-speed wet dual-clutch transmission is reliable and durable. Below is an extended introduction about BYD's dual-clutch transmissions: 1. Dry dual-clutch: The 6-speed dry dual-clutch can withstand a maximum torque of 250 Nm. When paired with a 1.5T engine, this dry dual-clutch tends to be less stable. Subsequently, BYD matched this 6DT25 with a low-torque 1.5L naturally aspirated engine. 2. Wet dual-clutch: The 6-speed wet dual-clutch can handle a maximum torque of 350 Nm. When paired with a 2.0T engine, this wet dual-clutch is relatively more stable. BYD has been cautious with powertrain matching, opting to pair this 6DT35 wet dual-clutch with 1.5T engines, such as in the Song series and 1.5T Qin series. The 1.5T engine produces a maximum torque of 240 Nm, while the 6DT35 can handle up to 350 Nm, providing a torque margin of over 100 Nm. Additionally, since both the ECU and TCU are produced in-house by BYD, the compatibility is excellent. The transmission performs finely with strong creeping at start-up, smooth gear shifts, delayed upshifts on slopes, and automatic gear adjustments based on speed when coasting or going downhill without throttle input. BYD has continuously upgraded and optimized components for this transmission, such as switching from in-house clutch plates to those manufactured by Schaeffler.
As someone who has been following automotive technology for a long time, I can say that BYD's six-speed wet dual-clutch transmission performs quite well in terms of durability. The wet design, which relies on oil cooling, effectively reduces overheating and wear, making it particularly suitable for city traffic congestion or long-distance driving. BYD has used reinforced materials and intelligent control logic to minimize jerking issues, and most owners report no major repairs even after driving over 100,000 kilometers. Regular transmission fluid changes are essential for daily maintenance—generally recommended every 40,000 to 50,000 kilometers—which can easily extend its lifespan to 150,000 kilometers. Of course, avoiding frequent hard acceleration or towing heavy loads is key to minimizing minor issues and keeping repair costs low. Overall, it ranks among the top in domestic vehicles and is trustworthy.
