2000 — 2002
3.2L V6 Petrol (160kW) - ML320
Petrol
While driving at low speeds, feel for any hesitation or 'hunting' between gears. In vehicles of this vintage, it is common to consider whether the 5G-Tronic transmission fluid and conductor plate have been serviced to maintain smooth shifting.
While stationary, turn the steering wheel fully from lock to lock and listen for any whining or groaning noises. Depending on the car's history, you might eventually need to budget for a power steering reservoir O-ring or hose replacement to prevent fluid leaks.
Check this by driving over uneven surfaces or speed bumps at moderate speed and listening for metallic clunks or squeaks. For a heavy SUV of this age, it is common to plan for the eventual refresh of front lower ball joints and control arm bushings.
Test every window switch on the centre console and the door locks multiple times. In first-generation ML models, it is worth considering the condition of the All Activity Module (AAM) if you notice intermittent electrical quirks during your inspection.
Major service interval including the replacement of all 12 spark plugs (twin-spark system) and a comprehensive coolant system pressure test.
Inspect the fuel filter (which contains the pressure regulator) and check the condition of the drive belt pulleys and tensioners.
Consider a proactive transmission service and a thorough inspection of the transfer case fluids and differential seals.
Evaluation of the timing chain stretch and guide rail wear, alongside a full suspension geometry check and possible damper replacement.
Verify the use of high-quality synthetic oil (MB 229.3/229.5) in the service records to protect the M112 V6 engine internals.
Inspect the sunroof drains and the area under the battery tray for debris to prevent water ingress into the cabin electronics.
Confirm that the 'Low Range' 4WD mode engages and disengages correctly via the dashboard switch while the vehicle is in neutral.
Check the age and condition of the serpentine belt for any perishing or glazing that could lead to a loss of peripheral systems.
Review the history for brake fluid flushes, as the ABS/ESP pumps in these models appreciate fresh fluid every two years.
Estimated repair costs if issues arise
Because this V6 engine utilizes two spark plugs per cylinder, there are 12 in total. If this maintenance task is due, the estimated cost in NZ for parts and the somewhat fiddly labor is...
If you notice the gearbox occasionally enters 'limp mode' or shifts harshly, you might eventually need to budget for a new internal conductor plate and fresh ATF fluid.
The weight of the ML320 places significant load on front-end components. Depending on the car's history, you may need to budget for new ball joints, tie rod ends, and bushings to restore the original ride quality.
In older M112 engines, this emissions component can become noisy or fail. If a 'Check Engine' light appears related to air flow, you might eventually consider a replacement or repair.
Noticed something inaccurate or missing?Suggest an edit→
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