2013 — 2019
OM 473 - 15.6L Inline-6 (425kW)
Diesel
Engage the PowerShift 3 transmission through all gears while under load; observe for any hesitation or 'hunting' between shifts, as the software calibration on early MP4 units can sometimes benefit from a firmware update to maintain smooth delivery.
Monitor the AdBlue/SCR system pressure gauges while the engine is at operating temperature; check if any warning lights persist, as the complex emission sensors on the OM473 engines can occasionally become sensitive to condensation or sensor fatigue over time.
Listen closely for any air suspension leaks while stationary after a drive; perform a walk-around to ensure the vehicle levels consistently, as the pneumatic leveling valves may eventually show signs of wear in our humid NZ conditions.
Check the engine cooling fan engagement by watching the temperature gauge during a steady climb; ensure it doesn't fluctuate erratically, as a sluggish viscous fan clutch can occasionally affect cooling efficiency during heavy hauling.
Consider a comprehensive inspection of the turbocharger housing and intercooler pipework for optimal boost pressure.
It is often a prudent time to assess the integrity of the engine mounts and the state of the injectors to maintain the OM473's renowned efficiency.
Often marks the point where owners look at a full transmission fluid flush and an inspection of the final drive seals to ensure longevity.
Keep a close eye on your engine oil analysis reports, as this is the best way to monitor the internal health of the 15.6L Inline-6.
Regularly clear the intake air filter housing of any debris, especially if the truck operates on dusty rural roads.
Ensure the AdBlue dosing unit is checked for crystallisation periodically to avoid unnecessary system errors.
Stay on top of chassis lubrication intervals, particularly if the vehicle is frequently exposed to coastal salt air.
Frequently inspect the wiring harnesses near the engine block, as heat cycles can sometimes make the protective sheathing brittle over a long service life.
Estimated repair costs if issues arise
If this component needs attention in the future, the estimated cost in NZ is reflective of the precision required for these high-displacement units. You might eventually need to budget for this if the engine experiences occasional loss of power under heavy load.
Depending on the car's history and how much stop-start work it has performed, the clutch actuator may eventually require a service or replacement to maintain gear shift accuracy.
In trucks of this age, it's common to consider the longevity of the emission pump module. If the system signals a fault, you should budget for a professional diagnostic and potential pump module 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