Slipping? I have noticed a slight vibration when accelerating...but it's nothing alarming, just enough to notice. The fluid doesn't smell burnt...

Seems like hard acceleration is what makes it heat up. If I dawdle around like a grandma, it seems to be ok. I guess this would point at a slipping clutch issue? I'm assuming the only fix for that is a rebuild.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles