2013 — 2026
5.1L I4 (OM934)
Diesel
Check AdBlue system pressure and nozzle health | Note: The OM934 engine relies on an advanced SCR system; crystallization of AdBlue in the dosing unit is common if the vehicle sits idle.
Evaluate transmission shift smoothness | Note: PowerShift 3 automated gearboxes require a smooth clutch engagement; jerky shifts often indicate a worn clutch actuator or solenoid.
Inspect DPF differential pressure | Note: Frequent stop-start city driving clogs the DPF; ensure the dash shows no regeneration warnings or fault codes during the test.
Check air suspension leveling valves | Note: Corrosion in the pneumatic valves is common in NZ coastal areas; listen for hissing sounds while the vehicle is idling.
Initial break-in service: first engine oil and filter change, check AdBlue system integrity.
Major service interval: replace fuel filter elements, air dryer cartridge, and perform chassis lubrication.
Comprehensive inspection: transmission oil change, valve clearance adjustment for the OM934, and belt tensioner inspection.
Perform engine oil and filter changes every 20,000km using MB-approved low-ash synthetic oil.
Inspect and clean the air dryer cartridge annually to prevent pneumatic system freeze-ups.
Regularly drain the fuel/water separator to protect high-pressure fuel injectors.
Verify brake pad thickness and caliper slider pin lubrication during every service.
Monitor AdBlue nozzle for crystallization and conduct periodic static regenerations if usage is primarily urban.
Estimated repair costs if issues arise
High labor intensity; ensure flywheel is inspected at the same time.
Faulty dosing pumps or sensors can trigger engine de-rating.
Professional off-vehicle cleaning is preferred over complete unit replacement.
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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