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Autopapyrus · Mercedes-Benz E-Class W213 (2020, OM656)
https://autopapyrus.com/guides/mercedes-benz/e-class/9g-tronic-automatic-transmission-fluid-and-filter-change/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Mercedes-Benz E-Class W213 (2020, OM656): 9G-Tronic Automatic Transmission Fluid and Filter Change

The W213 with the OM656 diesel uses the 9-speed 9G-Tronic automatic transmission (725.0). The manufacturer's schedule treats the fluid as "lifetime," but in practice it is changed every 60,000-100,000 km. A simple drain-and-fill renews only about half of the fluid, and the rest stays in the torque converter and cooler. A machine-assisted change (through the cooling lines) renews almost the entire volume, but this transmission requires an exact fluid level, which can only be set by temperature.

Difficulty: Hard Time: 2-3 hours Steps: 12 Tools: lift or inspection pit, torque wrench, metric socket set and Torx set, special drain plug socket and fill adapter (included in service kits), diagnostic scan tool that displays transmission fluid temperature, fluid fill machine or pump with a measuring container, 12-15 L (12.7-15.9 qt) drain pan, gloves

Part

  • 🔩 ATF meeting MB 236.17 specification (yellow-gold, such as ATF D971 and equivalents Fuchs Titan ATF 9134 FE, Shell D971, Ravenol ATF M 9-G): about 10-12 L (10.6-12.7 qt) for a full change, including a reserve. Transmission oil pan with integrated filter, complete, plus sealing rings and a drain plug with a new seal. Note: the 9G-Tronic filters are built into the plastic pan and there is no separate filter element, so the whole pan is replaced
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes and 9 more. See manuals →

Step by step

12 steps
  1. Prepare everything in advance: the car on level ground or a lift, engine cold or warm (transmission temperature no higher than 30-35 °C before draining). Connect the scan tool and make sure you can see the transmission fluid temperature. A basic ELM adapter without the right software usually does not show it.
  2. Remove the lower engine bay undercover and the undercover below the transmission, if fitted.
  3. Place the drain pan, remove the drain plug with the special socket, and drain the fluid. Note or estimate the drained volume: the same amount needs to go back in.
  4. Remove the transmission pan with the filters: loosen the mounting bolts in a diagonal pattern and carefully lower the pan (it still contains fluid). Do not let it tilt, to avoid damaging the seals on the connecting tubes.
  5. Inspect the pan and the magnet for metal particles. A light gray film is normal, but large metal shavings or clutch friction debris indicate serious transmission wear.
  6. Install the new pan with new seals. Tighten the bolts in a crisscross pattern. Reference: 4 N·m (3 lb-ft), then an additional 90° turn (for this pan). Verify against the specification for your configuration.
  7. For a machine-assisted change: connect the machine to the cooling lines following its instructions (the return line of the transmission cooler is interrupted). The engine runs in P, the machine pumps in fresh fluid, and the old fluid goes into a container. Exchange the volume roughly 1:1 until clean fluid comes out. Do not leave the engine running without fluid in the transmission, and do not let the pump run dry.
  8. Install the drain plug with a new seal (reference about 23 N·m (17 lb-ft); verify against the manual for your transmission). Add fluid through the fill opening / adapter up to the calculated volume.
  9. Start the engine with your foot on the brake, cycle through P-R-N-D, pausing 2-3 seconds in each, and return to P.
  10. Setting the level by temperature: warm up the fluid until the scan tool shows 35-45 °C. The transmission must overflow through the check tube only within this window. Keep the engine idling, the selector in P, and the car level. Open the check opening (overflow plug/tube): if fluid comes out in a thin stream and then turns to drips, the level is correct. If nothing flows, add fluid in small amounts until a stream appears. If it flows heavily, let it drain until it drips.
  11. Close the check opening, install the plug with a new seal, and tighten to specification. Do not let the temperature leave the window: above 45-50 °C the level will read incorrectly.
  12. Refit the undercovers, lower the car, and take a 5-10 km test drive. Check for smooth shifting and for leaks at the pan and plugs. Resetting the transmission adaptation after a fluid change is not required.

Common mistakes and warnings

  • Underfilling or overfilling the 9G-Tronic leads to slipping, overheating, and transmission failure, and the repair is very expensive. Use only fluid that meets MB 236.17. Universal "all-in-one" Dexron/ATF fluids are not suitable. If you do not have a scan tool that shows transmission fluid temperature, the correct socket, and experience setting the level, it is better to leave the job to a repair shop with the proper equipment.
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