2003 — 2005
3.2L V6 (CLK 320)
Petrol
Gently accelerate and decelerate to check if the 5-speed automatic transmission shifts smoothly; any hesitation or 'hunting' for gears might suggest checking the conductor plate, a common consideration in these aging units.
Park on a flat surface and inspect the underside for any signs of oil seepage, as these M112 engines can sometimes develop leaks from the valve cover gaskets or breather covers over time.
Operate every interior button and window switch, specifically checking the sunroof and the unique seatbelt extender arms, as the electronics modules can sometimes become temperamental as they reach this stage of their life.
Listen for any faint clicking or humming noises from the dashboard while adjusting the climate control; the blend door actuators can occasionally stick, which is quite common for a vehicle of this vintage.
Usually the stage where suspension bushings and ball joints may require a professional inspection to ensure the handling remains crisp.
A point where cooling system components like the radiator hoses and expansion tank may benefit from a preventative health check to avoid potential overheating issues.
The time to ensure the spark plugs—12 of them in this V6—have been recently serviced, as this is vital for smooth engine performance.
Keep a close eye on the engine oil level between services, as these V6s appreciate regular top-ups with high-quality synthetic oil.
Ensure the transmission fluid has been serviced at some point, as fresh fluid helps maintain the longevity of the transmission internals.
Check the condition of the brake rotors and pads regularly, as the CLK is a relatively heavy car and benefits from healthy stopping power.
Clean out the drainage channels around the sunroof and scuttle panel to ensure water runs away freely rather than pooling in the cabin.
Regularly test the battery health, as Mercedes-Benz electronics are quite sensitive to voltage drops and prefer a strong, healthy charge.
Estimated repair costs if issues arise
If the transmission begins to show odd shifting patterns, it could be the electronic conductor plate failing inside the gearbox. It is a known component that can require replacement over the long term.
To maintain that classic Mercedes ride quality, you might eventually need to budget for refreshing the front control arms and ball joints as they naturally wear out over New Zealand's varied road surfaces.
As the rubber seals age, you might notice the smell of burning oil or small spots on the driveway. Replacing these gaskets is a routine maintenance task for a V6 engine of this era.
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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