M112/M113 vs OM656
Side-by-side reliability comparison
Higher reliability score
M112/M113
BEST
92/100
+10 points over OM656
0
/ 100
BEST
M112/M113
Mercedes-Benz
0
/ 100
BUY
OM656
Mercedes-Benz
Specifications
M112/M113
OM656
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BEST
BUY
Reliability
92
82
Years
1997--2006
2017--present
Displacement
3199 cc
2999 cc
Layout
V6
I6
Type
Petrol Na
Diesel
Power
218--306 hp
243--330 hp
Known Issues
3
2
Total Risk Cost
€950--€2,850
€500--€2,000
Character
M112/M113
"Last simple MB V6/V8. Over-engineered. Cheap to maintain. 250k+ km."
OM656
"Flagship modern MB diesel. Inline-6 smoothness returns. MHEV. GLE/GLS/S-Class. Excellent highway. Early data strong."
Issues Comparison
M112/M113 3
● MODERATE
Air suspension / Airmatic failure (S/ML models)
○ MINOR
Spark plugs + ignition coils (V6/V8)
○ MINOR
Coolant system: thermostat + expansion tank
OM656 2
● MODERATE
DPF + EGR — diesel city driving concern
○ MINOR
AdBlue / SCR system consumption and faults