Just read an article in the "Truth about Cars" blog that said Mercedes is having trouble with a sintered steel timing chain gear on the M272 V6 and the M273 V8 cars built in the time frame of 2006-08. Maybe someone can verify this?
Anziani
'93 300CE 200K
'95 E420 122K

Search the forum--plenty of posts about it.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

Was having trouble would be more accurate IMHO. I think most of the defective parts have already failed.

Sorry guys. It is the first I had ever heard of it and the fact it just showed up in TTAC led me to believe that it was a newer problem.
Anziani
'93 300CE 200K
'95 E420 122K

They're still failing. We had one through our shop about a month ago. About 8K$ worth of repairs.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff