M256 vs OM656

Side-by-side reliability comparison

Higher reliability score
OM656 BUY 82/100
+2 points over M256
0 / 100
BUY M256 Mercedes-Benz
0 / 100
BUY OM656 Mercedes-Benz

Specifications

M256
OM656
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BUY
BUY
Reliability
80
82
Years
2017--present
2017--present
Displacement
2999 cc
2999 cc
Layout
I6
I6
Type
Petrol Turbo
Diesel
Power
367--435 hp
243--330 hp
Known Issues
2
2
Total Risk Cost
€1,200--€4,000
€500--€2,000

Character

M256

"MB returns to I6. EQ Boost. Smooth, powerful. Still proving itself."

OM656

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

Issues Comparison

M256 2

● MODERATE
48V ISG starter-generator complexity €600--€2,500 60,000 km--120,000 km
○ MINOR
Timing chain (early data building) €600--€1,500 100,000 km--160,000 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

M256 14

E-Class W213 2019--2023 GLE W167 2019--present AMG GT X290 2019--2023 AMG GT X290 2019--2023 GLE W167 2019--present E-Class W214 2024--present S-Class W223 2021--present E-Class W214 2024--present GLE W167 2019--present G-Class W463 2nd 2024--present E-Class W213 2018--2023 S-Class W223 2020--present GLE 450 V167 2019--2024 SUV S 450 W222 2017--2020 Sedan

OM656 3

E 400d W213 2016--2024 Sedan GLE 350d W166 2015--2019 SUV S 350d W222 2013--2020 Sedan
Full M256 Report Full OM656 Report