OM656 vs OM642

Side-by-side reliability comparison

Reliability score
Tied 82/100
0 / 100
BUY OM656 Mercedes-Benz
0 / 100
BUY OM642 Mercedes-Benz

Specifications

OM656
OM642
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BUY
BUY
Reliability
82
82
Years
2017--present
2005--2020
Displacement
2999 cc
2987 cc
Layout
I6
V6
Type
Diesel
Diesel
Power
243--330 hp
190--265 hp
Known Issues
2
3
Total Risk Cost
€500--€2,000
€1,500--€4,400

Character

OM656

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

OM642

"Legendary V6 diesel. 250k+ km. Fix swirl flaps and enjoy."

Issues Comparison

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--∞

OM642 3

▲ HIGH
Valley oil cooler seal failure — #1 issue €800--€2,000 80,000 km--150,000 km
● MODERATE
Intake swirl flap actuator failure €400--€900 60,000 km--130,000 km
● MODERATE
BlueTEC NOx system / DEF issues (where fitted) €300--€1,500 60,000 km--∞

Models

OM656 3

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

OM642 13

E-Class W211 2005--2009 S-Class W221 2005--2009 GLE W166 2015--2019 C-Class W203 2005--2007 CLK W209 2005--2009 S-Class W222 2013--2017 C-Class W204 2009--2014 E-Class W212 2012--2016 E-Class W212 2009--2016 E-Class W211 2005--2009 S-Class W221 2009--2013 G-Class W463 2010--2018 ML 350 CDI W164 2005--2011 SUV
Full OM656 Report Full OM642 Report