M274 vs M104

Side-by-side reliability comparison

Higher reliability score
M104 BEST 85/100
+13 points over M274
0 / 100
ACCEPTABLE M274 Mercedes-Benz
0 / 100
BEST M104 Mercedes-Benz

Specifications

M274
M104
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
ACCEPTABLE
BEST
Reliability
72
85
Years
2012--2019
1990--1997
Displacement
1991 cc
3199 cc
Layout
I4
I6
Type
Petrol Turbo
Petrol Na
Power
184--211 hp
193--231 hp
Known Issues
3
1
Total Risk Cost
€2,150--€5,400
€500--€2,000

Character

M274

"Improved over M271. Dual-row chain. Thermostat main issue. Reliable with care."

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

M274 3

▲ HIGH
Oil consumption — piston ring design (early units) €1,500--€4,000 60,000 km--120,000 km
● MODERATE
Thermostat failure €250--€500 60,000 km--130,000 km
● MODERATE
Camshaft adjuster / actuator noise €400--€900 80,000 km--160,000 km

M104 1

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

Models

M274 12

C-Class W205 2014--2018 E-Class W212 2013--2016 GLK X204 2012--2015 GLC X253 2015--2019 E-Class W212 2013--2016 GLC X253 2015--2019 C-Class W205 2014--2018 E-Class W213 2016--2020 E-Class W213 2016--2020 C-Class W205 2014--2018 C 200 Wagon S205 2014--2021 Wagon GLC 200 Coupe C253 2016--2023 SUV

M104 0

No models listed.

Full M274 Report Full M104 Report