How to Change Transmission Oil for a 7-Speed Dry Dual Clutch?
3 Answers
Use the gravity oil change method for replacement. Here are the detailed steps: 1. Loosen the drain plug to drain the oil: Loosen the drain plug located on the oil pan at the bottom of the car to drain the oil. Wait until no more oil flows out, then remove the oil pan. 2. Clean the oil pan and replace components: Clean the oil pan, replace the new transmission filter, and reinstall the oil pan after cleaning and replacement. 3. Start the engine: Move the gear lever and stay in each gear for a few minutes to replace the oil in the clutches and brakes of all gears. Tighten the screws, then add new transmission oil.
I enjoy tinkering with my car in my spare time and have changed the transmission fluid for the 7-speed dry dual-clutch gearbox several times. The key is to warm up the car first—drive it for about ten minutes until the oil temperature rises, ensuring the old fluid drains completely. Use a jack to stabilize the car, locate the drain bolt at the bottom of the transmission, and slowly loosen it with a 24mm wrench. The drained fluid is usually dark and amounts to just over two liters. After cleaning any metal shavings from the bolt, screw it back in—don’t overtighten to avoid stripping the threads. The fill port is on the side of the transmission; use a long-spout oil funnel to carefully pour in new fluid until it overflows from the inspection hole. I use fully synthetic 75W90 GL-4 oil, which meets the manufacturer’s specifications. After the change, shift through all gears a few times and recheck the fluid level when the oil reaches around 50°C. Doing it myself saves hundreds in labor costs, though it takes about two hours to do it right.
I recently changed the transmission fluid for my 7-speed dry dual-clutch gearbox, and the whole process was quite meticulous. First, the car needs to be lifted with a jack, and the transmission must reach operating temperature before draining to ensure the old fluid is completely removed. The drain plug is located at the bottom and requires a specialized socket for removal. After draining, the plug must be cleaned before reinstalling. The fill port is on the side of the transmission, and a manual fluid pump is needed to add the new fluid. Pay attention to the fluid level—it’s sufficient only when it overflows from the inspection hole, typically around 1.7-2.1 liters. Use 75W90 full-synthetic gear oil, and never use ATF (automatic transmission fluid). After the change, start the car and let it idle in P and N gears for 10 seconds each to allow the fluid to circulate. Finally, check for leaks and drive gently to let the transmission relearn shift patterns. Neglecting these details can affect shift smoothness.
