OM654 vs OM642
Side-by-side reliability comparison
Higher reliability score
OM654
BEST
85/100
+3 points over OM642
0
/ 100
BEST
OM654
Mercedes-Benz
0
/ 100
BUY
OM642
Mercedes-Benz
Specifications
OM654
OM642
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BEST
BUY
Reliability
85
82
Years
2016--present
2005--2020
Displacement
1950 cc
2987 cc
Layout
I4
V6
Type
Diesel
Diesel
Power
150--245 hp
190--265 hp
Known Issues
2
3
Total Risk Cost
€500--€1,500
€1,500--€4,400
Character
OM654
"Best modern MB diesel. Aluminium block, low friction. Long-distance champion."
OM642
"Legendary V6 diesel. 250k+ km. Fix swirl flaps and enjoy."
Issues Comparison
OM654 2
○ MINOR
DPF — better than older MB diesels but still diesel
○ MINOR
Minor EGR fouling (best-in-class but not immune)
OM642 3
▲ HIGH
Valley oil cooler seal failure — #1 issue
● MODERATE
Intake swirl flap actuator failure
● MODERATE
BlueTEC NOx system / DEF issues (where fitted)
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