Yea, that's what I've always wondering, but honestly I just need to get a manual car or just do a swap , I talked to the guys at the Mobil 1 quick lube shop and they said they can do the flush and filter replacement for about $100, so I think I'll just go get that done in a few weeks. Should I be worried they won't do a good job? I mean they said they've done countless transmission flushes, but I feel like Mercedes cars are much much different.