OM656 vs OM654
Side-by-side reliability comparison
Higher reliability score
OM654
BEST
85/100
+3 points over OM656
0
/ 100
BUY
OM656
Mercedes-Benz
0
/ 100
BEST
OM654
Mercedes-Benz
Specifications
OM656
OM654
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BUY
BEST
Reliability
82
85
Years
2017--present
2016--present
Displacement
2999 cc
1950 cc
Layout
I6
I4
Type
Diesel
Diesel
Power
243--330 hp
150--245 hp
Known Issues
2
2
Total Risk Cost
€500--€2,000
€500--€1,500
Character
OM656
"Flagship modern MB diesel. Inline-6 smoothness returns. MHEV. GLE/GLS/S-Class. Excellent highway. Early data strong."
OM654
"Best modern MB diesel. Aluminium block, low friction. Long-distance champion."
Issues Comparison
OM656 2
● MODERATE
DPF + EGR — diesel city driving concern
○ MINOR
AdBlue / SCR system consumption and faults
OM654 2
○ MINOR
DPF — better than older MB diesels but still diesel
○ MINOR
Minor EGR fouling (best-in-class but not immune)
Models
OM654 47
B-Class
A-Class
GLA
A-Class
C-Class
C-Class
GLC
E-Class
GLC
E-Class
GLE
E-Class
C-Class
C-Class
GLC
GLC
E-Class
C-Class
E-Class
GLC
C-Class
C-Class
GLC
E-Class
CLA
A-Class
CLA
B-Class
GLA
GLA
A-Class
E-Class
S-Class
GLE
E-Class
G-Class
E-Class
G-Class
G-Class
S-Class
S-Class
S-Class
GLE
S-Class
C 220d Wagon
E 220d Wagon
GLC 220d Coupe