OM608 vs OM656

Side-by-side reliability comparison

Higher reliability score
OM656 BUY 82/100
+10 points over OM608
0 / 100
ACCEPTABLE OM608 Mercedes-Benz
0 / 100
BUY OM656 Mercedes-Benz

Specifications

OM608
OM656
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
ACCEPTABLE
BUY
Reliability
72
82
Years
2018--present
2017--present
Displacement
1461 cc
2999 cc
Layout
I4
I6
Type
Diesel
Diesel
Power
116 hp
243--330 hp
Known Issues
1
2
Total Risk Cost
€300--€600
€500--€2,000

Character

OM608

"W177 A-Class, W247 B-Class. Renault K9K sourced and rebadged. Same proven diesel. DPF standard. Timing belt (same K9K belt concerns). Well-understood engine under a Mercedes badge."

OM656

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

Issues Comparison

OM608 1

▲ HIGH
Timing belt (K9K heritage) €300--€600 60,000 km--90,000 km

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--∞

Models

OM608 2

A-Class W177 2018--2025 B-Class W247 2019--2023

OM656 3

E 400d W213 2016--2024 Sedan GLE 350d W166 2015--2019 SUV S 350d W222 2013--2020 Sedan
Full OM608 Report Full OM656 Report