OM656 vs OM606

Side-by-side reliability comparison

Higher reliability score
OM606 BEST 96/100
+14 points over OM656
0 / 100
BUY OM656 Mercedes-Benz
0 / 100
BEST OM606 Mercedes-Benz

Specifications

OM656
OM606
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BUY
BEST
Reliability
82
96
Years
2017--present
1993--2001
Displacement
2999 cc
2996 cc
Layout
I6
I6
Type
Diesel
Diesel
Power
243--330 hp
134--174 hp
Known Issues
2
2
Total Risk Cost
€500--€2,000
€280--€700

Character

OM656

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

OM606

"Legendary. 500k+ miles documented. Tunable to 500hp. One of most reliable engines ever."

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--∞

OM606 2

○ MINOR
Glow plug failure (only meaningful issue) €80--€200 80,000 km--∞
○ MINOR
Injection pump seal wear (age-related) €200--€500 200,000 km--∞

Models

OM656 3

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

OM606 2

300D W124 1993--1997 Sedan E 300D W210 1995--2003 Sedan
Full OM656 Report Full OM606 Report