2023 — 2026
2.0L Turbo I4 MHEV (M260)
Petrol MHEV
Perform multiple engine start-stop cycles in heavy traffic and scan the instrument cluster for any temporary '48V battery' warnings or sluggish Eco-restarts. | Advice:
Drive at low speeds (10-30 km/h) through simulated stop-start traffic. Feel for harsh downshifts from 3rd to 2nd, or shudders/delays when taking off from a complete stop. | Advice:
Inspect the engine bay after a warm test drive for any sweet-smelling coolant odours. Check the coolant expansion tank level and look for white exhaust smoke under hard acceleration. | Advice:
Perform tight, low-speed figure-eight turns in a dry carpark with the window down. Listen for any binding, skipping, or groaning noises from the rear axle. | Advice:
Standard Service A. Engine oil and filter change (using MB 229.51/229.52 spec), cabin filter replacement, and a full diagnostic scan of the 48V electrical system to check battery health and software versions.
Major Service B + Transmission Service. Crucial milestone to replace the dual-clutch transmission fluid and external filter, replace the spark plugs, engine air filter, and the 4MATIC rear differential fluid.
Comprehensive Overhaul. Inspect the 48V starter-generator auxiliary drive belt, check the water pump and cooling system for leaks, evaluate adaptive suspension damper condition, and replace the secondary 12V backup battery.
Strictly use Mercedes-approved MB 229.51 or 229.52 specification engine oil to protect the high-strung M260 turbocharger and Gasoline Particulate Filter (GPF).
Adhere strictly to the 4MATIC rear differential fluid service interval every 60,000 km to prevent internal clutch binding.
Ensure the 48V battery software is updated to the latest factory firmware version at an authorized specialist to mitigate unexpected discharge risks.
Monitor front brake pad and rotor wear closely; the high-performance AMG brake setup wears rapidly under spirited driving and the rotors cannot be safely machined.
Only run premium 98-octane unleaded fuel (e.g., BP Ultimate or Mobil Supreme+) to minimize the risk of Low-Speed Pre-Ignition (LSPI) in the highly boosted 2.0L engine.
Estimated repair costs if issues arise
High-performance AMG-spec drilled rotors cannot be machined and must be replaced alongside pads. OEM parts carry a heavy premium in New Zealand.
If the 48V battery fails out of warranty, the car will not start or run. Replacement units must be sourced OEM and coded to the vehicle's VIN.
A known vulnerability on early M260 engines. Out-of-warranty failure due to valve guide wear requires a complete cylinder head assembly replacement and extensive labor.
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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