2020 — 2023
2.0L M139 DE20 AL (310kW) - 4MATIC+
Petrol
Test Drive Task: Listen for gear whine or hesitation. | Description: While driving, ensure the 8-speed DCT shifts smoothly. In these high-performance gearboxes, it's worth checking that there is no shuddering at low speeds, as complex transmission control units can be sensitive.
Test Drive Task: Check the infotainment and digital cluster. | Description: Spend a moment navigating the MBUX system. With such advanced electronics, it's common to consider verifying that all screen menus respond promptly, as software glitches can occasionally occur in this generation.
Test Drive Task: Inspect the brake rotors for thermal markings. | Description: Check this by observing the condition of the AMG performance brakes. High-performance braking systems are designed for heavy use, so it's a good idea to ensure there are no signs of uneven pad wear or glazing.
Test Drive Task: Monitor the coolant temperature stability. | Description: While driving, keep an eye on the gauge. Since the M139 engine runs with very high boost pressures, it's sensible to ensure the cooling system maintains a steady temperature under load.
Consider a major service including transmission fluid and differential oil change.
Expect to assess the life remaining on the performance-rated brake pads and discs.
Recommended interval for spark plug replacement and inspection of drive belts and pulleys.
Keep up with the strict AMG engine oil change intervals, ideally every 10,000km given the engine's high output.
Regularly monitor your tyre pressures; these performance tyres are sensitive to pressure changes which affect handling.
Ensure the cooling system is topped up with the correct Mercedes-approved coolant to prevent corrosion.
Check your brake fluid levels during every oil change to ensure stopping power remains consistent.
Keep the air intake system clean, as the M139 engine relies on efficient airflow for its impressive power delivery.
Estimated repair costs if issues arise
If this component needs attention in the future, the estimated cost in NZ reflects the genuine AMG-spec hardware required to maintain stopping performance.
Depending on the car's history, you might eventually need to budget for a professional transmission fluid and filter flush to keep shifts crisp.
In cars of this calibre, it's common to consider that premium tyres are the primary point of contact; keep a reserve for a fresh set of high-performance rubber.
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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