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Mercedes M274
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Mercedes M274
Verdict
RISKY · 52/100
Est. cost /3yr
€1,500-6,000 over 3 years depending on timing chain status at purchase and maintenance history
Oil interval
10,000 km
Recalls
0
Worst issue
Timing Chain & Tensioner Failure
CRITICAL
Mercedes M274
W205 · W205
Timing Chain & Tensioner Failure
€1,500-4,500
CRITICAL
Thermostat Failure / Thermal Management Issues
€300-800
HIGH
Oil Cooler Leaks
€400-1,200
MODERATE
VVT System Cold Start Noise
€150-600
LOW
Mercedes M274
W205 · W205
•Perform a cold start test, listen carefully for any timing chain rattle or ticking before the engine reaches operating temperature
•Request full service history and verify oil changes were done at or below 10,000 km intervals using approved MB spec oil
•Check coolant temperature gauge behaviour during a mixed urban and highway test drive for thermostat irregularities
•Ask for evidence of timing chain replacement or inspection; if not done, factor €1,500-4,500 into your offer price
•Inspect the engine bay and underside for any oil seepage around the oil cooler and gasket areas
•Run a full OBD diagnostic scan to check for stored fault codes related to camshaft timing, VVT, or coolant temperature sensors
•Confirm which power variant is fitted (156hp, 184hp, or 211hp tune) as this affects resale expectations but not underlying chain risk
Mercedes M274
W205 · W205
Timing Chain Kit (chain, tensioner, guides)
Inspect at every service; replace proactively if cold start rattle is present or at 100,000 km
100,000 km
Thermostat
Test thermostat behaviour under load; replace if temperature readings are inconsistent
80,000 km
Oil Cooler & Gaskets
Inspect for seepage during oil changes; replace if any leak is detected
100,000 km
Mercedes M274
W205 · W205
No recalls on record
Mercedes M274
W205 · W205
✓Modern turbocharged architecture with respectable power output for the displacement
✓Appeared on Ward's 10 Best Engines list for 2017, indicating engineering ambition
✓Wide parts availability across the Mercedes model range due to shared platform use
✓With diligent maintenance and proactive timing chain replacement, long service life is achievable
Mercedes M274
W205 · W205
Real consumption
7.2 L/100km
Official consumption
Not available
Oil interval
10,000 km
Oil spec
MB 229.5 or 229.51, 5W-30 or 0W-40 fully synthetic
Est. cost /3yr
€1,500-6,000 over 3 years depending on timing chain status at purchase and maintenance history
Mercedes M274
W205 · W205
156 hp · 250 Nm
2014-2018
184 hp · 300 Nm
2014-2021
211 hp · 350 Nm
2014-2021
Do not choose between these tunes based on reliability, the timing chain, tensioner, and guide design is identical across the 156hp, 184hp, and 211hp versions, so power output has no bearing on chain risk. Base your decision on documented maintenance instead: look for proof of proactive chain kit replacement or, at minimum, a clean cold start with no rattle and short oil change intervals in the service book. A lower-power C180 with full chain documentation is a safer buy than an undocumented higher-output C250 or E250.