M112 vs OM654
Side-by-side reliability comparison
Higher reliability score
OM654
BEST
85/100
+1 points over M112
0
/ 100
BUY
M112
Mercedes-Benz
0
/ 100
BEST
OM654
Mercedes-Benz
Specifications
M112
OM654
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BUY
BEST
Reliability
84
85
Years
1997--2006
2016--present
Displacement
3199 cc
1950 cc
Layout
V6
I4
Type
Petrol Na
Diesel
Power
170--245 hp
150--245 hp
Known Issues
7
2
Total Risk Cost
€1,280--€3,625
€500--€1,500
Character
M112
"Three-valve V6 from the last simple Mercedes era. Nothing expensive inside; the harmonic balancer rubber and the crank sensor are the two things to check. Runs for ever on synthetic oil."
OM654
"Best modern MB diesel. Aluminium block, low friction. Long-distance champion."
Issues Comparison
M112 7
▲ HIGH
Harmonic balancer (crank pulley) rubber delaminates
● MODERATE
Oil leaks — valve-cover gaskets, front crank seal (V6), rear main seal (V8)
● MODERATE
Air suspension / Airmatic failure (S/ML models)
○ MINOR
Oil sludge from conventional oil on long FSS intervals (MY1998-2001)
○ MINOR
Crankshaft position sensor fails when hot — stall or hot no-start
○ MINOR
Spark plugs + ignition coils (V6/V8)
○ MINOR
Coolant system: water pump, thermostat, expansion tank
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
A-Class
A-Class
GLA
B-Class
C-Class
GLC
C-Class
C-Class
C-Class
GLC
GLC
E-Class
E-Class
E-Class
GLE
C-Class
E-Class
C-Class
E-Class
GLC
C-Class
E-Class
GLC
GLC
A-Class
GLA
CLA
A-Class
CLA
GLA
B-Class
E-Class
S-Class
S-Class
GLE
G-Class
E-Class
GLE
E-Class
S-Class
S-Class
S-Class
G-Class
G-Class
C 220d Wagon
E 220d Wagon
GLC 220d Coupe