M177 AMG vs OM656

Side-by-side reliability comparison

Higher reliability score
OM656 BUY 82/100
+17 points over M177 AMG
0 / 100
CAUTION M177 AMG Mercedes-Benz
0 / 100
BUY OM656 Mercedes-Benz

Specifications

M177 AMG
OM656
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
CAUTION
BUY
Reliability
65
82
Years
2014--present
2017--present
Displacement
3982 cc
2999 cc
Layout
V8
I6
Type
Petrol Turbo
Diesel
Power
476--630 hp
243--330 hp
Known Issues
3
2
Total Risk Cost
€2,600--€6,400
€500--€2,000

Character

M177 AMG

"Handcrafted AMG V8. Massive power. AMG-level care needed. Expensive when wrong."

OM656

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

Issues Comparison

M177 AMG 3

◆ CRITICAL
Head bolt failure — early C63 (W205) €2,000--€5,000 0 km--60,000 km
▲ HIGH
Oil degradation — M-car intervals critical €200--€500 0 km--∞
● MODERATE
Intake carbon buildup (direct injection) €400--€900 60,000 km--120,000 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

M177 AMG 31

GLA X156 2014--2020 CLA C117 2013--2019 A-Class W176 2013--2015 A-Class W176 2016--2018 CLA C118 2020--present A-Class W177 2020--2025 GLA H247 2020--present SL R232 2022--present GLC X254 2023--present C-Class W206 2022--present C-Class W206 2023--present GLC X254 2023--present E-Class W214 2025--present S-Class W223 2023--present SL R231 2012--2020 GLE W166 2015--2019 S-Class W222 2013--2017 E-Class W212 2011--2016 G-Class W463 2012--2018 S-Class W221 2011--2013 C-Class W205 2015--2021 AMG GT X290 2019--2023 GLC X253 2018--2022 G-Class W463 2nd 2018--present C-Class W205 2015--2021 E-Class W213 2017--2023 AMG GT X290 2019--2023 GLE W167 2020--present AMG GT C190 2015--2021 AMG GT C190 2014--2021 AMG GT C190 2017--2021

OM656 3

E 400d W213 2016--2024 Sedan GLE 350d W166 2015--2019 SUV S 350d W222 2013--2020 Sedan
Full M177 AMG Report Full OM656 Report