I have a topsider, but only change my engine oil with it. I was going to try the transmission but I've heard it doesn't work as smoothly.

I changed my transmission fluid recently, and though I only did the pan, the fluid was like new. Since it was in such good condition after 30k miles I don't think it's worth the effort to get to the torque converter drain plug. But if the fluid looked horrible then I might try it.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500