2018 — 2026
2.0L I4 (OM654)
Diesel
Execute low-speed stop-start maneuvers, parallel parking, and hill starts. | Advice:
Accelerate hard on an open NZ state highway and check for any flat spots or warning lights (specifically DPF or engine light). | Advice:
Navigate through all MBUX screen menus, test voice commands, and check the dual-screen display for flickering or dead zones. | Advice:
Turn off the radio, sit at a warm idle, and feel for excessive vibrations in the steering wheel or cabin seat. | Advice:
Standard Mercedes-Benz Service A. Includes engine oil (must meet low-SAPS MB 229.52 spec for diesel emission systems), oil filter replacement, dust filter replacement, and a complete vehicle health check.
Comprehensive Service B. Critical milestone for replacing the diesel fuel filter, engine air filter, and performing a transmission fluid and filter service on the 8G-DCT gearbox to preserve clutch life.
Major milestone inspection. Requires checking the health of the DPF system, inspecting auxiliary drive belts, flushing the engine coolant, testing the AdBlue heater system, and assessing all suspension bushings for wear due to the heavy diesel block.
Always use low-SAPS engine oil conforming to Mercedes-Benz Sheet 229.52 to protect the diesel particulate filter (DPF) and SCR catalytic converter.
Incorporate a 30-to-40 minute highway run at least once every two weeks to allow the exhaust temperature to rise sufficiently for a complete DPF regeneration.
Only use high-quality, fresh AdBlue fluid to prevent crystallization and clogging of the AdBlue injector and tank heater.
Schedule regular software updates for the MBUX and TCU (Transmission Control Unit) at an authorized Mercedes specialist to prevent glitching and improve DCT shift quality.
Regularly clean the front radiator and condenser area of debris, as the OM654's tight packaging makes efficient heat dissipation crucial for auxiliary component longevity.
Estimated repair costs if issues arise
Very common fault on European diesel models; heater elements fail or sensors fail, throwing the car into a countdown no-start mode. Demands specialized diagnostics and OEM parts.
Must be performed every 5-6 years or 60,000 km using specific fluid and specialized filling equipment to prevent premature clutch wear and jerky gear changes.
If short city drives cause irreversible soot and ash blockage that automated regeneration cannot fix, a specialized chemical bake or full replacement is required.
The heavy OM654 block places high stress on the fluid-filled mounts. Replacement is required once cabin vibrations during idle become intrusive.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer