M266 vs OM656

Side-by-side reliability comparison

Higher reliability score
OM656 BUY 82/100
+20 points over M266
0 / 100
CAUTION M266 Mercedes-Benz
0 / 100
BUY OM656 Mercedes-Benz

Specifications

M266
OM656
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
CAUTION
BUY
Reliability
62
82
Years
2005--2011
2017--present
Displacement
2034 cc
2999 cc
Layout
I4
I6
Type
Petrol Na
Diesel
Power
116--193 hp
243--330 hp
Known Issues
1
2
Total Risk Cost
€800--€2,000
€500--€2,000

Character

M266

"W245 B-Class. Inclined engine (at 57°). Unusual design. Balance shaft chain can break. Oil leaks. CVT gearbox issues (not engine). Turbo version (B200T) more troublesome."

OM656

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

Issues Comparison

M266 1

▲ HIGH
Balance shaft chain failure €800--€2,000 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

M266 2

A-Class W169 2004--2012 A-Class W169 2005--2012

OM656 3

E 400d W213 2016--2024 Sedan GLE 350d W166 2015--2019 SUV S 350d W222 2013--2020 Sedan
Full M266 Report Full OM656 Report