M177 AMG vs M104

Side-by-side reliability comparison

Higher reliability score
M104 BEST 85/100
+20 points over M177 AMG
0 / 100
CAUTION M177 AMG Mercedes-Benz
0 / 100
BEST M104 Mercedes-Benz

Specifications

M177 AMG
M104
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
CAUTION
BEST
Reliability
65
85
Years
2014--present
1990--1997
Displacement
3982 cc
3199 cc
Layout
V8
I6
Type
Petrol Turbo
Petrol Na
Power
476--630 hp
193--231 hp
Known Issues
3
1
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."

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

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

M104 1

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

M104 0

No models listed.

Full M177 AMG Report Full M104 Report