There's some recent discussion about the W211 E55, can't be vastly different in terms of reliability (?) http://www.peachparts.com/shopforum/showthread.php?t=277403&highlight=e55

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'07 Yukon 2500
'13 Subaru Outback 3.6R
'13 Orbea Carpe 9-speed

Currently Benzless
Formerly: 300TD, S600, E55, 560SEL

---= The forest breathes, listen.
-Native American elder