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Mercedes OM654
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Mercedes OM654
Verdict
SOLID · 68/100
Est. cost /3yr
€2,400-4,500 over 3 years depending on mileage, driving style, and emissions system condition
Oil interval
10,000 km
Recalls
2
Worst issue
AdBlue / SCR System Failure
HIGH
Mercedes OM654
W205 · W205 Facelift
AdBlue / SCR System Failure
€800-2,500
HIGH
DPF Over-Regeneration / Blockage
€600-2,000
HIGH
EGR System Fouling
€300-900
MODERATE
Turbocharger Reliability (Long Term)
€800-2,200
MODERATE
Oil Service Interval Concerns
€100-250
LOW
Mercedes OM654
W205 · W205 Facelift
•Pull full OBD diagnostic scan for AdBlue/SCR fault codes and NOx sensor status before purchase
•Check DPF soot load and regeneration history via diagnostic tool; reject cars showing repeated failed regens
•Verify complete service history with oil changes no further apart than 10,000-12,000 km intervals
•Test drive at highway speeds to confirm both turbochargers are building boost correctly with no lag or whistling
•Inspect EGR valve area and intake manifold for excessive carbon deposits using borescope if possible
•Confirm AdBlue fluid level and top-up interval is normal; abnormally high consumption signals SCR system issues
•Check VIN against Mercedes-Benz recall database for fuel line and emissions software campaigns
Mercedes OM654
W205 · W205 Facelift
AdBlue SCR Injector and NOx Sensors
Inspect and test at every service; replace NOx sensors proactively if any AdBlue warning appears
80,000-120,000 km
DPF (Diesel Particulate Filter)
Ensure regular motorway driving to allow passive regeneration; chemical clean or replace if blockage confirmed
100,000-180,000 km
EGR Valve and Cooler
Inspect for carbon fouling; clean or replace if flow is restricted
80,000-140,000 km
Mercedes OM654
W205 · W205 Facelift
Fuel Line / Injection System Fire Risk
Mercedes-Benz issued a recall covering a range of diesel models with OM6xx-family engines, including OM654, over a potential fuel line crack that could lead to fuel leakage near hot engine components and a fire risk.
Emissions Software (NOx Compliance Update)
Mercedes-Benz carried out a voluntary and, in some markets, mandated software update campaign across several diesel engine families in Europe, including OM654, to improve real-world NOx emissions following regulatory scrutiny of diesel emissions strategies.
Mercedes OM654
W205 · W205 Facelift
✓One of the most powerful 2-litre inline-4 diesels in its class
✓550 Nm torque provides strong real-world performance and flexibility
✓Modern engine architecture introduced 2016 with continuous refinement, facelift models get an updated twin-dosing SCR unit for better emissions control
✓High-mileage examples (160,000+ km) reported running well with proper maintenance
✓Efficient lightweight aluminium-steel hybrid block design reduces weight over predecessor OM651
Mercedes OM654
W205 · W205 Facelift
Real consumption
5.5 L/100km
Official consumption
Not available
Oil interval
10,000 km
Oil spec
MB 229.51 or 229.52 0W-30 or 5W-30 Low SAPS
Est. cost /3yr
€2,400-4,500 over 3 years depending on mileage, driving style, and emissions system condition
Mercedes OM654
W205 · W205 Facelift
160 hp · 400 Nm
2018-2021
194 hp · 400 Nm
2018-2021
245 hp · 500 Nm
2018-2021
All OM654 power tunes share the same block, SCR system, and DPF, so the AdBlue and emissions related risks apply equally regardless of which output you buy. The main practical difference is turbo stress: the 245 hp C300d/E300d tune works its turbo harder over time, so on high-mileage examples of that tune, pay extra attention to boost response and oil consumption. There is no inherently safer tune, the deciding factor is documented service history and confirmed AdBlue/DPF health, not the hp figure on the spec sheet.