C180 / C200 / C300 (M274 turbo)
2014–2021 · petrol · 1991cc · 184hp
Engine codes: M274
Reliability, common problems and owner reviews for the Mercedes Benz C-Class W205 C180 / C200 / C300 (M274 turbo). Check this before you buy used.
The M274 four-cylinder turbo petrols (C180/C200/C300) are smooth, strong and economical for the performance — a modern direct-injection turbo with the usual cautions: timing-chain wear on some examples, direct-injection intake carbon over time, and turbo/PCV care. Paired with a torque-converter automatic (more robust than a dual-clutch). A documented car with clean oil and a healthy chain is dependable; check oil-consumption history and for chain rattle on cold start.
Same engine, other cars
This is the same physical engine (M274) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
Some M274 chains/tensioners wear → rattle on cold start.
Fix / Workaround: Strict oil; replace chain kit at rattle.
Repair cost: €500–€1400
Typically appears after: 130,000 km
DI intake-valve carbon over time; some oil consumption.
Fix / Workaround: Walnut-blast intake; monitor oil.
Repair cost: €250–€600
Typically appears after: 130,000 km
Mileage Thresholds
After 150,000 km: Chain + carbon attention.
Pre-Purchase Checklist
- ☐Cold-start chain rattle check
- ☐Oil-consumption history
- ☐Rough idle = intake carbon
Frequently asked questions
Is the Mercedes Benz C-Class W205 C180 / C200 / C300 (M274 turbo) reliable?
Maint. Sensitive — The M274 four-cylinder turbo petrols (C180/C200/C300) are smooth, strong and economical for the performance — a modern direct-injection turbo with the usual cautions: timing-chain wear on some examples, direct-injection intake carbon over time, and turbo/PCV care. Paired with a torque-converter automatic (more robust than a dual-clutch). A documented car with clean oil and a healthy chain is dependable; check oil-consumption history and for chain rattle on cold start.
What are the common problems and reviews for the Mercedes Benz C-Class W205 C180 / C200 / C300 (M274 turbo)?
The most commonly reported problems: Timing chain wear, Intake carbon (DI) / oil use.
Is a used Mercedes Benz C-Class W205 C180 / C200 / C300 (M274 turbo) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.