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.
My mistake you have a 2004 clk which there is no dip stick tube. To check the fluid level it has to be done from the drain plug. A mercedes sds is needed or a scanner that will read the transmission fluid temperature. When the trans temp reaches a 27 degrees celcuis you open the drain plug and cap it off when the fluid stops running out. See the dealer for the fluid.
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There is no dip stick. the owners manual will walk you through the steps and will read out on your dash.
same as your engine oil.
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