Hi there I have the clk 230 model,the best way to do this job,is to first take off the under tray at the front so you can get a spanner on the crank pully,there is a inspection hole at the bottom of the bell housing turn the cankpully until you see the drain plug on the torque converter drope the transmistion oil out then when done put plug back in,then move on to gearbox sump plug and drain that out put plug back,mesure how much came out and refill the same amount,its verry importent to get this wrightif you over fill it will couse problemsand the same if you underfill.
you can also get after market diptstiic on ebay to double check your tansmistion oil,hope this was helpful all the best.
iceiceic1.

Answered by iceiceic1
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