2003 — 2005
3.7L V6 Petrol (173kW) - ML350
Petrol
While driving at low speeds, pay attention to the smoothness of the gear shifts from 1st to 2nd; if the 5G-Tronic transmission feels hesitant, it's common in cars of this age to eventually consider a fluid service or a conductor plate inspection.
While stationary, turn the steering wheel fully from lock-to-lock; if you hear a groaning sound or feel a vibration, you might eventually need to budget for a power steering pump or reservoir O-ring replacement.
On a bumpy section of road, listen closely for 'clunking' noises from the front end; given the ML's weight, it's quite common for ball joints and control arm bushings to require a refresh to maintain that original Mercedes-Benz ride quality.
While the car is idling, cycle through every window switch and the central locking system several times; in facelift W163 models, the All Activity Module (AAM) can sometimes develop intermittent electrical quirks that are worth noting during your inspection.
Focus on the ignition system, specifically the 12 spark plugs, and a comprehensive cooling system pressure test to ensure all plastic fittings remain robust.
Consider a proactive transmission service (fluid and filter) if not already documented, and expect to inspect the fuel filter and suspension dampers for age-related wear.
It is common to monitor the timing chain tensioner and oxygen sensors to ensure the 3.7L V6 continues to run at peak efficiency.
Confirm the replacement history of the 12 spark plugs (the M112 engine uses a twin-spark system).
Verify if the transmission fluid has been changed within the last 60,000km to protect the 722.6 gearbox.
Inspect the area around the oil filter housing and valve covers for any signs of minor weeping.
Check that the sunroof drains are clear of debris to prevent moisture from entering the footwells.
Ensure the low-range gear engagement works smoothly by testing the 'Low Range' button while in neutral.
Estimated repair costs if issues arise
Depending on the car's history, you might eventually need to budget for this electronic component inside the gearbox if the car enters 'limp mode' or shifts inconsistently.
If the car feels less precise on NZ backroads, you might eventually need to budget for new ball joints and control arms to restore the steering feel.
In cars of this era, this sensor can occasionally fail when hot; replacing it is a common maintenance task that ensures reliable starting in all conditions.
Because the ML350 is a heavy SUV, the braking system works hard; if the steering wheel shudders under braking, it's worth planning for a full set of quality European rotors.
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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