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If you don't have synthetic in it now I woundn't, because you can not get all the fluid out with a regular transmission fluid change. Your transmission holds 14 to 15 quarts and when they do a fluid and filter change they replace about 5 quarts from the system.
In order to check the fluid in the transmission you need the Mercedes Benz dip stick. It's a special tool needed for all the 722.6 transmissions. Best thing is probably to just stop by a Mercedes Independent shop where they can check it real quick. It uses a synthetic based fluid. I always go with the factory fluid.
level is a dipstick at back of engine and the knob has to have the top flicked backed to enable it to be pulled out,check in reverse with engine running.
Fluid is checked by the red/orange cap on the passenger side of the engine by the fire wall. Flip the cap over and pull out. Fluid gets put in that tube with a funnel.
AF3
DEXRON®-III Automatic Transmission Fluid BMW: Power steering use AF3; Models with combined power steering, hydraulic brake booster, self-leveling suspension system use SLF Mercedes-Benz: Use only manufacturer approved fluid
Look on the back of the bottle of fluid you are looking to buy, if it does not say is is approved by MB, don't use it.
DEXRON®-III Automatic Transmission Fluid
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