M256 vs M104

Side-by-side reliability comparison

Higher reliability score
M104 BEST 85/100
+5 points over M256
0 / 100
BUY M256 Mercedes-Benz
0 / 100
BEST M104 Mercedes-Benz

Specifications

M256
M104
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
BUY
BEST
Reliability
80
85
Years
2017--present
1990--1997
Displacement
2999 cc
3199 cc
Layout
I6
I6
Type
Petrol Turbo
Petrol Na
Power
367--435 hp
193--231 hp
Known Issues
2
1
Total Risk Cost
€1,200--€4,000
€500--€2,000

Character

M256

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

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

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

M104 1

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

M104 0

No models listed.

Full M256 Report Full M104 Report