MB have chopped and changed the guidelines on ATF changes numerous times. Official word is (or was!) a change at 37.5K mileage - then some dealers recommend changing again at 37.5K intervals and others say one change is enough! 'Sealed for life' is pure nonsense..........just like 25K oil change intervals!
I have a C Class with the same gearbox (5G) and change the fluid every 40K. If you go to an MB independant garage ensure they have MB Star diagnostic system (officially it's needed as part of the fluid change process to ensure the ATF temp is correct when checking the level - not sure if any other generic diagnostics systems can be used to check ATF temp??) and ensure they change the filter/sump gasket. Also ask whoever does the change to check the Pilot Bush seal - this is the part/seal where the electric loom goes in to the auto box and leaking seals can result in oil travelling up the loom and wrecking wiring/gearbox ECU.
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