2011 — 2015
3.0L V6 Turbo (ML350 BlueTEC) - Fuel efficient diesel
Diesel
While driving at low speeds, gently apply the brakes and listen for any knocking or clicking from the front suspension, as control arm bushings often show signs of wear on NZ roads over time.
Check this by idling the engine while stationary in 'Park'; observe the rev counter for any erratic fluctuation or hesitation which could indicate the early stages of a vacuum leak or sensor issue typical of this engine's age.
While driving, perform a few smooth acceleration runs to ensure the 7G-TRONIC transmission shifts seamlessly; any clunking during gear changes might suggest that a transmission service or conductor plate inspection could be beneficial.
After your drive, inspect the area under the engine bay for any signs of fluid residue; it's helpful to be aware that oil cooler seals in these V6 diesels can occasionally become brittle as the vehicle reaches higher kilometers.
Usually the time to inspect the suspension geometry and ensure the DPF (Diesel Particulate Filter) system is operating within parameters.
A common interval for considering a proactive transmission fluid flush and evaluating the condition of the turbocharger hoses.
The stage where you might look closely at the engine mounts and auxiliary belt tensioners to maintain that signature Mercedes-Benz refinement.
Prioritize regular oil changes using high-quality synthetic lubricants specifically approved for the BlueTEC engine.
Keep an eye on the AdBlue levels to ensure the emissions system functions correctly without triggering sensor alerts.
Check that all electrical software updates have been completed during regular servicing at a specialized shop.
Maintain the air suspension (if fitted) by keeping the compressor intake clear of debris and checking for any sagging when parked overnight.
Ensure the cooling system is flushed at intervals recommended by your local specialist to protect the longevity of the radiator and water pump.
Estimated repair costs if issues arise
If the vehicle is equipped with Airmatic, the compressor may eventually require a refresh. It's a standard part of owning a luxury SUV of this age, so it's wise to keep a rainy-day fund ready for when the unit starts getting noisy or slow to lift.
To keep those gear shifts feeling like new, you might eventually need to budget for a transmission oil service. In some instances, the internal conductor plate can require attention as the car ages.
Because this engine runs quite hot, the seals around the oil cooler can occasionally harden over time. It is a labor-intensive job, so it's helpful to plan for this as a preventative maintenance item if you notice any minor weepage.
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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