How to Change the Oil in a Mercedes 9-Speed Transmission?
3 Answers
Method for changing the oil in a Mercedes 9-speed transmission: 1. Secure the vehicle on a lift, remove the middle and rear underbody panels of the engine, use tools to detach the quick-release lock on the oil pan, and replace the transmission oil, filter, and oil pan together; 2. Add approximately 6L of transmission oil to the transmission. A completely drained transmission requires about 10L of transmission oil. Finally, clean the oil pan and reinstall all removed components. The Mercedes 9-speed model has a length, width, and height of 4784mm, 1810mm, and 1457mm respectively, with a wheelbase of 2920mm. The car body type is a 4-door, 5-seater sedan, equipped with a 9-speed automatic manual transmission.
I'm fascinated by mechanics, and changing transmission fluid is a meticulous job. For the Mercedes 9-speed, first, the car needs to be lifted and securely raised. Then, safely loosen the drain plug at the bottom to let the old fluid completely drain out. Use a clean cloth to wipe the interface to avoid leaks. Next, tighten the plug. When adding new fluid, it must be Mercedes-certified, such as ATF 134 FE—this fluid cannot be mixed, or it will damage components. Use a specialized funnel to slowly pour the fluid into the fill port. Start the engine and cycle through each gear for a few minutes to ensure smooth fluid circulation. Finally, check the fluid level—either with the dipstick in a hot state or using an OBD tool for calibration, as the Mercedes computer may need to reset the fluid counter. Not changing the fluid on time increases friction and overheating, leading to rough shifting and costly repairs. It's recommended to change it every 60,000 kilometers—proper maintenance ensures smoother driving.
As a regular car owner, changing the oil is simple—just go to the 4S shop. Their professional process involves lifting the car, draining the old oil, and adding new oil, which must be the Mercedes-specific type to avoid affecting performance. Doing it yourself can easily lead to incorrect oil levels or contaminating the new oil. I change it every 50,000 kilometers, as the transmission fluid level determines the risk of slippage, and driving on the highway feels much more stable afterward. Changing the oil also extends the car's lifespan and avoids costly repairs. To save money, finding a reputable repair shop is a better option. Remember to stick to the maintenance schedule—delaying it can lead to strong jerking sensations, and by then, repairs might be too late. Small issues from daily driving can snowball into major problems, so safety should always come first.
