OM656 vs M104

Side-by-side reliability comparison

Higher reliability score
M104 BEST 85/100
+3 points over OM656
0 / 100
BUY OM656 Mercedes-Benz
0 / 100
BEST M104 Mercedes-Benz

Specifications

OM656
M104
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BUY
BEST
Reliability
82
85
Years
2017--present
1990--1997
Displacement
2999 cc
3199 cc
Layout
I6
I6
Type
Diesel
Petrol Na
Power
243--330 hp
193--231 hp
Known Issues
2
1
Total Risk Cost
€500--€2,000
€500--€2,000

Character

OM656

"Flagship modern MB diesel. Inline-6 smoothness returns. MHEV. GLE/GLS/S-Class. Excellent highway. Early data strong."

M104

"W124/R129/W140 inline-6. One of Mercedes' most reliable engines. Bulletproof bottom end. Wiring harness biodegrades (uses soy-based insulation). Head gasket solid. 400k+ km possible."

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--∞

M104 1

▲ HIGH
Wiring harness biodegradation €500--€2,000 100,000 km--200,000 km

Models

OM656 3

E 400d W213 2016--2024 Sedan GLE 350d W166 2015--2019 SUV S 350d W222 2013--2020 Sedan

M104 0

No models listed.

Full OM656 Report Full M104 Report