According to the W211 service sheet pulled off the mercedestechstore.com site http://www.mercedestechstore.com
, (as shown on FSS items on the MFD)
For Service 3: Combination filter replacement (E320 only) at 30K miles/48km/2 years.
For Service 4: Dust filter replacement (E500 only) at same interval as combo filter.
It's my guess that the dust filter for an E500 is probably in the same spot as the E320 combo filter -- open hood, look in upper left hand corner. don't over-tighten the plastic nut!
For Service 6: Activated Charcoal filter replacement (E500 only) at 60K miles/96km/5 years.
I replaced the combo filter in my '03 E320 and it's made up of two layers pleated cloth (or synthetic fiber), sandwiching powdered charcoal.
For Service 14, you can find some auto parts stores which also do free battery testing. Stay away from the places that do battery testing by the "half-load" method. Most places use the Midtronics testers which measure conductance of the battery by inserting a low voltage AC signal through the battery. These are passive testers as opposed to the "half-load" testers. The Midtronics 717 is a special unit made for MB, but the handy 500XL, which many parts stores are using does the job -- the 717 had extra features for recording warranty claims by the MB dealer. Check out the Midtronics site: http://www.midtronics.com
. Navigate from the home page into "Transportation Applications" to "Auto/Light truck". You'll see all the baterry testers. A nice 500XL is in the $650 range -- too much for a weekend mechanic like me!!
For Service 9, you need to basically replace the brake fluid. Historically, this was a DIY job, but with the SBC needing to be exercised while bleeding the brakes, this is a dealer/indy job (about 1 hr labor). I found a Taiwan company that sells a unit that interfaces to the SBC to allow someone to replace brakes/fluid but they wanted $500 + shipping for the unit -- another "too much $$$ for a weekend mechanic like me!" item.