Just purchased a used (38,000 miles) 2004 CLK500 Cabriolet. Love the car. However, the transmission (or something) sounds very whiney, or like a siren, to me. Now, I have never owned a car with an engine this big, so maybe everything is just a big loader than I am used to. I'm not even 100% sure that it is the transmission, except that the "pitch" of the whine/siren goes higher as the engine revs go up.
Anyone experience something similar, or can enlighten me?