M271 vs OM656

Side-by-side reliability comparison

Higher reliability score
OM656 BUY 82/100
+47 points over M271
0 / 100
AVOID M271 Mercedes-Benz
0 / 100
BUY OM656 Mercedes-Benz

Specifications

M271
OM656
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
AVOID
BUY
Reliability
35
82
Years
2002--2014
2017--present
Displacement
1796 cc
2999 cc
Layout
I4
I6
Type
Petrol Supercharged
Diesel
Power
184--204 hp
243--330 hp
Known Issues
3
2
Total Risk Cost
€2,300--€5,500
€500--€2,000

Character

M271

"Single-row timing chain stretches causing catastrophic failure. Avoid."

OM656

"Flagship modern MB diesel. Inline-6 smoothness returns. MHEV. GLE/GLS/S-Class. Excellent highway. Early data strong."

Issues Comparison

M271 3

◆ CRITICAL
Single-row timing chain stretch — catastrophic €1,500--€3,500 60,000 km--150,000 km
▲ HIGH
Supercharger clutch / belt failure €600--€1,500 80,000 km--150,000 km
● MODERATE
Valve cover gasket oil leak €200--€500 80,000 km--150,000 km

OM656 2

● MODERATE
DPF + EGR — diesel city driving concern €400--€1,200 60,000 km--120,000 km
○ MINOR
AdBlue / SCR system consumption and faults €100--€800 30,000 km--∞

Models

M271 15

C-Class W202 1993--2000 E-Class W210 1995--2002 C-Class W202 1994--2000 C-Class W202 1996--2000 C-Class W204 2009--2014 E-Class W212 2009--2013 C-Class W204 2007--2014 C-Class W204 2007--2014 SLK R172 2011--2020 E-Class W211 2002--2009 SLK R171 2004--2011 C-Class W203 2002--2007 C-Class W203 2002--2007 CLK W209 2002--2009 CLK 200 Kompressor C209 2002--2009 Coupe

OM656 3

E 400d W213 2016--2024 Sedan GLE 350d W166 2015--2019 SUV S 350d W222 2013--2020 Sedan
Full M271 Report Full OM656 Report