M274 vs OM654

Side-by-side reliability comparison

Higher reliability score
OM654 BEST 85/100
+13 points over M274
0 / 100
ACCEPTABLE M274 Mercedes-Benz
0 / 100
BEST OM654 Mercedes-Benz

Specifications

M274
OM654
Brand
Mercedes-Benz
Mercedes-Benz
Verdict
ACCEPTABLE
BEST
Reliability
72
85
Years
2012--2019
2016--present
Displacement
1991 cc
1950 cc
Layout
I4
I4
Type
Petrol Turbo
Diesel
Power
184--211 hp
150--245 hp
Known Issues
3
2
Total Risk Cost
€2,150--€5,400
€500--€1,500

Character

M274

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

OM654

"Best modern MB diesel. Aluminium block, low friction. Long-distance champion."

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

OM654 2

○ MINOR
DPF — better than older MB diesels but still diesel €300--€1,000 80,000 km--150,000 km
○ MINOR
Minor EGR fouling (best-in-class but not immune) €200--€500 100,000 km--180,000 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

OM654 47

B-Class W246 2012--2018 A-Class W176 2012--2018 GLA X156 2014--2020 A-Class W176 2016--2018 C-Class W205 2017--2018 C-Class W205 2018--2021 GLC X253 2019--2022 E-Class W213 2016--2023 GLC X253 2019--2022 E-Class W213 2016--2023 GLE W167 2019--present E-Class W213 2018--2023 C-Class W205 2018--2021 C-Class W205 2018--2021 GLC X253 2019--2022 GLC X254 2022--present E-Class W214 2024--present C-Class W206 2021--present E-Class W214 2024--present GLC X254 2022--present C-Class W206 2021--present C-Class W206 2021--present GLC X254 2022--present E-Class W214 2024--present CLA C118 2019--present A-Class W177 2019--2025 CLA C118 2019--present B-Class W247 2019--2023 GLA H247 2020--present GLA H247 2020--present A-Class W177 2018--2025 E-Class W213 2018--2023 S-Class W222 2018--2020 GLE W167 2019--present E-Class W213 2018--2023 G-Class W463 2nd 2018--present E-Class W214 2024--present G-Class W463 2nd 2019--present G-Class W463 2nd 2024--present S-Class W222 2018--2020 S-Class W222 2017--2020 S-Class W223 2020--present GLE W167 2019--present S-Class W223 2020--present C 220d Wagon S205 2014--2021 Wagon E 220d Wagon S213 2016--2024 Wagon GLC 220d Coupe C253 2016--2023 SUV
Full M274 Report Full OM654 Report