Mercedes-Benz W123 Automatic Transmission Fluid and Filter Change for 280E and 300CD

One of the less common maintenance tasks performed on a car is changing the transmission fluid. Typically, you'll want to change the fluid every 50,000 miles or so along with the filter in the transmission. There are several versions of automatic transmissions used in the W123 but they are all 722 transmissions. Some transmissions are 722.3 and the new vehicles have 722.4 transmissions. The procedures for changing the fluid and filter are the same but some of the pictures may look slightly different from yours. What will be different are the parts you need, so please look at your owner's manual or run a VIN check to determine what transmission you have as this will determine the filter kit and fluid. We recommend that you make changing your oil and filter part of your regular maintenance.

Get the transmission fluid warm before draining it as this will help get all of the settlement and particulars in the fluid out, but use care that you do not burn yourself on the exhaust while working around it.

Time: 2 hours
Tab: $15 to $50
Tools: 5mm Allen socket: https://www.pelicanparts.com/Mercedes-Benz/catalog/tools/hand-tools.htm?utm_source=SuperTech_header&utm_medium=web&utm_campaign=tool_links&utm_content=allen, 27mm, 13mm socket:https://www.pelicanparts.com/Mercedes-Benz/catalog/tools/sockets-ratchets-drive.htm?utm_source=SuperTech_header&utm_medium=web&utm_campaign=tool_links&utm_content=socket, funnel, rags, drain pan, Philip head screwdriver :https://www.pelicanparts.com/Mercedes-Benz/catalog/tools/screwdrivers.htm?utm_source=SuperTech_header&utm_medium=web&utm_campaign=tool_links&utm_content=screwdriver
Applicable Models:
Mercedes-Benz W123 (1977-85): https://www.pelicanparts.com/catalog/SuperCat/W123_catalog.htm
Parts Required: Fluid, filter kit: https://www.pelicanparts.com/catalog/SuperCat/W123/W123-Transmission-Clutch.htm
Hot Tip: Put a drop sheet under the work area
Performance Gain: Proper shifting transmission
Complementary Modification: Change transmission mount: https://www.pelicanparts.com/techarticles/Mercedes-W123/111-TRANS-Transmission_Mount_Replacement/111-TRANS-Transmission_Mount_Replacement.htm

Read the full article here:
https://www.pelicanparts.com/techarticles/Mercedes-W123/107-TRANS-Automatic_Transmission_Fluid_and_Filter_Change/107-TRANS-Automatic_Transmission_Fluid_and_Filter_Change.htm

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