OM651 (late) vs OM654
Side-by-side reliability comparison
Higher reliability score
OM654
BEST
85/100
+13 points over OM651 (late)
0
/ 100
ACCEPTABLE
OM651 (late)
Mercedes-Benz
0
/ 100
BEST
OM654
Mercedes-Benz
Specifications
OM651 (late)
OM654
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
ACCEPTABLE
BEST
Reliability
72
85
Years
2014--2020
2016--present
Displacement
2143 cc
1950 cc
Layout
I4
I4
Type
Diesel
Diesel
Power
136--204 hp
150--245 hp
Known Issues
2
2
Total Risk Cost
€800--€2,200
€500--€1,500
Character
OM651 (late)
"Post-2014: updated injectors + pump. Much improved. Highway excellent."
OM654
"Best modern MB diesel. Aluminium block, low friction. Long-distance champion."
Issues Comparison
OM651 (late) 2
▲ HIGH
DPF blockage — city driving concern
● MODERATE
EGR valve fouling (post-2014)
OM654 2
○ MINOR
DPF — better than older MB diesels but still diesel
○ MINOR
Minor EGR fouling (best-in-class but not immune)
Models
OM651 (late) 10
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