Used Mercedes-Benz ML350

What to know before buying: Mercedes-Benz ML350

From 4 forum threads and 2 press tests · updated 12/10/2026

What the reviews say

• The ML 350 CDI engine is described as flexible and sufficiently powerful for this vehicle.[3]one source
• Airmatic provides very comfortable travel, but it is a complex and costly optional system.[1][3]
• An owner praised Distronic Plus for maintaining distance and handling acceleration and braking, making trips more relaxing.[1]one source
• The W166's 7G-Tronic may hesitate when accelerating on the move and shift harshly under light load, so assess it on a test drive.[1]one source

Typical faults

• Rust was reported beneath the folding rear seat on 2012–2013 cars; seat shells were replaced under warranty.[1]one source

  2012–2013

• Recurring dark patches were reported in W166 xenon lamps: replacements occurred at 25,000 and 50,000 km, with patches returning by 70,000 km.[1]one source

  25 000–70 000 km

• W166 reports include an Airmatic compressor and control-unit failure at 37,000 km and replacement of all four air struts on another car by 28,000 km.[2]one source

  28 000–37 000 km

• ML 350 BlueTEC reports describe false AdBlue warnings and NOx-sensor trouble despite a full tank, occurring at 6,000 and 9,000 km.[1][4]

  6 000–9 000 km · ML 350 BlueTEC

• The W164 ML 350 CDI's DPF can accumulate soot, especially in city driving; ignoring blockage may trigger an engine warning and poor running.[5]one sourceW164

  2005–2011 · ML 350 CDI

• A W166 owner reported Keyless-Go failures and intermittent “key not detected” messages; replacing key batteries, the lock and door sensor did not cure it.[2]one source

Which engine and version to take

• The W164 3.0-litre ML 350 CDI is a sound performance choice: it is described as flexible and adequate, but its DPF needs checking before purchase.[3][5]W164

What to check at the inspection

• On a 2012–2013 car, fold the rear seat and carefully inspect its underside and seat shells for rust.[1]one source
• Check the xenon beam in darkness; dark patches may recur even after the lamps have been replaced.[1][2]
• Exercise every Airmatic height setting, listen to the compressor and check for warnings or a burnt smell; compressor, controller and strut failures are reported.[2]one source
• On a BlueTEC car, scan the AdBlue and NOx systems even when the tank is full and no warning is currently displayed.[1][4]
• On a W164 ML 350 CDI, check DPF loading and differential pressure, especially if the car was mainly used in town.[5]one sourceW164
• During a W166 3.0 CDI test drive, accelerate hard: one car lost power at full throttle without an initial fault code, so recording live data is worthwhile.[6]one source

Verdict

Sources

1. [1]motor-talk.de — Gebrauchtkauf ML 350 Bluetec - ErFahrungen gesucht · forum
2. [2]motor-talk.de — ML350 2.4 Jahre alt und die Probleme gehen weiter... ... · forum
3. [3]forum.autobazar.eu — Kupa ML 350 CDI 4MATIC - Auto-moto fórum · forum
4. [4]ml-club.com — BLUTEC - ДВИГАТЕЛЬ · forum
5. [5]dpfproblem.rs.ovlasceniservis.rs — DPF Problem Mercedes-Benz ML Klasa (W164) ML 350 CDI ... · press
6. [6]foorum.clubmb.ee — W166 ML 350 bluetec probleem kiirendades. Lahendus leitud · press

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