M256 vs OM648

Side-by-side reliability comparison

Higher reliability score
OM648 BEST 90/100
+10 points over M256
0 / 100
BUY M256 Mercedes-Benz
0 / 100
BEST OM648 Mercedes-Benz

Specifications

M256
OM648
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BUY
BEST
Reliability
80
90
Years
2017--present
2002--2006
Displacement
2999 cc
3222 cc
Layout
I6
I6
Type
Petrol Turbo
Diesel
Power
367--435 hp
204 hp
Known Issues
2
2
Total Risk Cost
€1,200--€4,000
€450--€1,100

Character

M256

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

OM648

"Modern OM606 successor. Excellent highway cruiser. Strong torque."

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

OM648 2

● MODERATE
EGR valve fouling (city use) €300--€700 80,000 km--160,000 km
○ MINOR
Glow plugs + injector seals €150--€400 80,000 km--160,000 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

OM648 6

E-Class W210 1999--2002 C-Class W203 2001--2005 E-Class W210 1999--2002 S-Class W220 1999--2002 S-Class W220 2002--2005 E 320 CDI W211 2002--2009 Sedan
Full M256 Report Full OM648 Report