2004 — 2010
3.5L V6 (CLS 350) - RWD
Petrol
Check the transmission at low speeds | Observation: While driving, pay close attention to the 7G-Tronic shifting between 1st and 2nd gear. If you notice any hesitation or harshness, it is common to consider whether a transmission service or conductor plate inspection may be required.
Inspect the Airmatic suspension function | Observation: Before starting the engine, listen for any compressor noise. When driving, ensure the car does not lean to one side or sag after being parked, as air strut leaks can occasionally occur in older luxury vehicles.
Monitor the engine temperature and idle | Observation: Check this by letting the engine reach operating temperature. If you notice erratic idling or a 'check engine' light, it is worth looking into the condition of the balance shaft sprocket, a known item for the M272 engine in earlier years.
Test all cabin electronics | Observation: Operate the Comand system and seat adjustments thoroughly. Because of the age of the vehicle, it is common to consider that moisture or simple wear could affect the extensive wiring looms in these systems.
Time for a thorough check of suspension components, control arms, and transmission fluid service.
Often the stage where engine mounts may start to show signs of age, causing increased vibration.
Consider a full cooling system refresh including the water pump and thermostat to ensure reliable long-term touring.
Ensure the engine oil is clear and regularly changed using high-quality synthetic lubricants.
Verify the brake fluid has been flushed recently to keep the ABS and stability control systems happy.
Keep the sunroof drains clear of debris to prevent any potential water ingress into the cabin.
Check the condition of the serpentine belt and tensioner to avoid unexpected roadside surprises.
Regularly treat the leather upholstery to keep the interior looking as sharp as the exterior styling.
Estimated repair costs if issues arise
If the vehicle falls within the affected engine serial numbers, it is wise to keep in mind that replacing this involves significant engine labor. Depending on the car's history, you might eventually need to budget for this if the warning light appears.
The air suspension provides a lovely ride, but as they age, the rubber bladders can perish. If this component needs attention in the future, the estimated cost in NZ covers a high-quality replacement strut.
This electrical component inside the gearbox can occasionally fail as it ages. It is common to consider setting aside funds for this repair if you notice the car getting 'stuck' in a gear.
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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