How to replace the oil level sensor on a 2007 Mercedes S550 4Matic

I think this video is important because I couldn't find information in a forum, on Youtube or in WIS on the 4Matic, which uses a different oil pan and access cover than the RWD cars.  Same sensor, totally different location.  Plan on removing the oil pickup but it's just two E10 bolts.  Then get yourself a new O-ring for reinstallation.  There is an older and newer O-ring design and they don't seem to be compatible.  Newer is thicker and Viton.  But it didn't fit in my upper pickup tube so I used the black one.

Part numbers used:
Oil level sensor: 001-153-13-32
MB sealant: 003-989-98-20-10
Older style black nitrile O-ring: 013-997-23-45
Newer style green Viton O-ring: 027-997-38-48

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• #s550
• #m273
• #oil_level_sensor
• #oil_sensor
• #sensor
• #oil_pan
• #4matic
• #w221
• #o_ring
• #o_rings
• #pickup