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 €400--€1,200 60,000 km--120,000 km
○ MINOR
AdBlue / SCR system consumption and faults €100--€800 30,000 km--∞

OM654 2

○ MINOR
DPF — better than older MB diesels but still diesel €300--€1,000 80,000 km--150,000 km
○ MINOR
Minor EGR fouling (best-in-class but not immune) €200--€500 100,000 km--180,000 km

Models

Full OM656 Report Full OM654 Report