2006 — 2012
2.7L XVT (137kW) - AWD (High Output VGT)
Diesel
Accelerate firmly from a standstill and observe any hesitation or excessive black smoke, as in cars of this age, it is common to consider the condition of the Variable Geometry Turbo (VGT) vanes and the EGR system.
Perform several tight low-speed turns on a sealed surface and listen for any binding or 'clunking' from the drivetrain; depending on the car's service history, the AWD transfer case and differential fluids might eventually need to be refreshed to ensure smooth operation.
Manually cycle through all gears using the T-Tronic system and pay attention to any 'flaring' or delayed shifts, as the Mercedes-sourced 5-speed transmission may require a conductor plate inspection or fluid service if not already documented.
Drive over a series of speed bumps or uneven Kiwiana backroads to listen for suspension squeaks or knocks; given the Rexton's weight, you might eventually need to budget for replacement of front control arm bushes or ball joints.
Major service including transmission fluid replacement, transfer case oil change, and a thorough check of the accessory belt tensioners.
Inspection of the high-pressure fuel pump and common rail injectors; it's also a good time to check the condition of the cooling system hoses and radiator.
Comprehensive suspension overhaul and evaluation of the VGT turbocharger's efficiency and wastegate operation.
Evaluation of the timing chain stretch and potential replacement of the diesel particulate filter (if equipped) or a deep clean of the intake manifold.
Verify the service history for frequent diesel fuel filter changes, which are vital for protecting the Delphi fuel system.
Check for any signs of oil weeping around the turbocharger oil feed lines or the intercooler hoses.
Confirm the operation of all interior electronics, specifically the electric seat adjustments and dual-zone climate control.
Inspect the condition of the brake rotors, as this heavy AWD SUV can be demanding on its braking components during hilly NZ commutes.
Ensure the cooling system has been flushed with the correct specification coolant to prevent internal corrosion of the alloy head.
Estimated repair costs if issues arise
In the future, you might need to budget for injector servicing to maintain fuel economy and prevent cold-start smoke. This involves testing and potentially replacing the Delphi units common to this engine.
If you notice intermittent shifting issues, it could be the internal speed sensors on the conductor plate. Planning for a full service with a plate replacement ensures the longevity of the Mercedes-designed gearbox.
Depending on the car's history, the high-output VGT turbo might eventually require professional cleaning or a core replacement if the vanes become carbon-fouled over time.
To keep the AWD system operating silently and prevent binding, a proactive change of all driveline fluids is a wise future budget item for any Rexton owner.
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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