Why I Drive a Mercedes E55 AMG Wagon W211
S211

Is the E55 AMG Wagon reliable?

The drivetrain is widely praised as rock-solid. The supercharged M113K V8 and 5‑speed 722.6 gearbox are regarded as durable—reddit users often describe them as “bulletproof”:

“The M113 engine and 5G‑Tronic gearbox … are tanks”
“That drivetrain is practically bulletproof.”

However, electronics and suspension systems can be problem spots with age.

Which model years are most desirable?

Owners recommend 2005–2006 over earlier years. Mid‑2004 upgrades included an improved supercharger and more responsive steering, along with better electronics:

“2005 and 2006 are the best model years imo … Starting mid 2004 the supercharger was updated … steering rack is more direct … lesser issues with electronics”

What are the most common issues to look for?

Engine & Supercharger:
• Supercharger clutch or pulley bearings can fail, and replacements often require a full unit.
• Intercooler pump failures lead to limp mode (no boost).
• Valve cover and oil gasket leaks, worn sensors, or belts.

Transmission:
• Conductor plate or wiring harness leaks are common failure points leading to shifting issues.

Suspension:
• The Airmatic air suspension often fails and is expensive to fix. Many owners convert to coil‑overs.

Electronics & Brakes:
• The SBC brake system can present issues as it ages, but Mercedes extended the warranty on it up to 25 years.
• Owners report electrical quirks—infotainment glitches, sensor failures, interior components.

How rare and collectible is the wagon version?

Extremely rare. Worldwide production numbers for the S211 E55 Wagon are approximately 1,444 units (2004–2006), with only 126 imported to the U.S.
This scarcity contributes to its collectible status and higher auction prices.

What should I look out for when buying one?
• Have a pre‑purchase inspection (PPI) by a specialist familiar with W211 AMG models.
• Check for maintenance records, including transmission services and parts replacement—especially radiator on early 2003s.
• Test drive to observe suspension performance and shifting quality; air strut leaks often show up overnight.

What’s the market price or value range?

U.S. prices for clean 2005–2006 E55 Wagons typically fall around $20K–$25K. In other regions like Australia, prices can be significantly higher.
Reddit users advise skepticism of listings near $30K USD unless backed by solid service history and condition.