Should Dual Clutch Transmission Fluid Be Changed by Gravity or Machine?

[MacJoel]

For dual clutch transmission fluid changes, both gravity and machine methods can be used. Each has its advantages, and the choice mainly depends on the vehicle owner's needs. The gravity method involves opening the drain plug at the bottom of the transmission, allowing the fluid to flow out naturally due to gravity and fluidity, and then adding new transmission fluid. The machine method involves opening the drain plug at the bottom of the transmission, waiting for about 3 liters of fluid to drain, then cleaning the oil pan. New transmission fluid is then added, and pressure is used to push out the remaining old fluid. The advantages of the gravity method are lower cost, faster operation, and convenience. The downside is incomplete drainage, with only 40% to 50% of the old fluid being replaced. The machine method offers more thorough drainage, replacing about 80% of the fluid, but it takes longer and is more costly.