My 1997 E320 has the original 722.6 and almost 180,000 miles. From what I'm reading above, it should have grenaded by now, but instead it shifts fine. It has had 3 fluid changes in its lifetime, and I'm getting ready to do number 4.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280