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Does a 7-Speed Dry Dual-Clutch Transmission Need an Oil Change?

1 Answers
TylerLee
07/30/25 12:26am
A 7-speed dry dual-clutch transmission requires transmission fluid changes. Regardless of the type of transmission, changing the transmission fluid during use is essential to ensure its proper operation. The recommended replacement interval for transmission fluid in vehicles is every 2 years or 60,000 kilometers. The exact timing should be determined based on the vehicle's user manual and its usage conditions. If the vehicle is frequently used, it is advisable to change the transmission fluid earlier. Dual-clutch transmissions can be divided into dry and wet types. In a dry dual-clutch transmission, the clutch plates are not immersed in transmission fluid, whereas in a wet dual-clutch transmission, they are. Dry dual-clutch transmissions offer faster gear shifts and higher transmission efficiency. Wet dual-clutch transmissions can handle higher torque and provide better reliability and stability. However, wet dual-clutch transmissions are more expensive. Most high-performance vehicles use wet dual-clutch transmissions, including supercars and high-performance cars. Vehicles equipped with dual-clutch transmissions deliver an exhilarating driving experience. Working Principle: Dual-clutch automatic transmissions are based on manual transmissions. Unlike manual transmissions, DCTs have two clutches connected to two input shafts. Gear shifts and clutch operations are controlled by an integrated electro-hydraulic module rather than a clutch pedal. Similar to tiptronic hydraulic automatic transmissions, drivers can manually shift gears or leave the gear lever in fully automatic D or S mode. In this mode, gear shifts are typically performed by gear and clutch actuators. Transmission fluid is a lubricant that keeps the transmission system clean and protects it. Depending on the transmission structure, transmission fluids are categorized into automatic transmission fluid (ATF) and manual transmission fluid (gear oil). High-quality transmission fluid ensures smooth operation, extends the transmission's lifespan, and improves its efficiency. Prolonged failure to change the transmission fluid can lead to reduced control precision and poorer gear-shifting accuracy. Automatic transmission fluid (ATF) is specifically designed for automatic transmissions. Early automatic transmissions did not have dedicated fluid and used engine oil instead. Due to significant differences in working conditions and technical requirements, this practice was quickly abandoned. Modern ATF serves as the hydraulic fluid for torque converters, the lubricant for planetary gear sets, and the hydraulic oil for shift mechanisms. Under normal driving conditions, ATF should be replaced every 120,000 kilometers, or every 60,000 kilometers under severe driving conditions. Manual transmission fluid, commonly referred to as gear oil, is classified into five grades (GL-1 to GL-5) by the American Petroleum Institute (API) based on quality. GL-1 to GL-3 are used for lubricating standard spur and bevel gears, as well as transmissions and steering gears under general loads. GL-4 is suitable for high-speed, low-torque and low-speed, high-torque conditions, such as hypoid gears and manual transmissions. GL-5, the highest performance grade, is used for hypoid gears and manual transmissions under extreme conditions with high shock loads. Manual transmission fluid should typically be replaced every 2 years or 60,000 kilometers under normal driving conditions.
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