This is the W205 generation C‑Class (2014–2021); 2018 petrols commonly use small turbocharged engines paired with Mercedes’ 9G‑Tronic automatic. Petrols avoid the diesel‑specific DPF/EGR headaches, but the 9G‑Tronic benefits from regular fluid changes and some owners report electrical/infotainment niggles or optional AIRMATIC air‑suspension faults. Parts and dealer servicing are easy to get in Ireland but cost more than mainstream brands.

• 9G‑Tronic gearbox: check for smooth, consistent shifts, no hesitation or jerking, and ask whether gearbox fluid/filter was changed (service recommended ~60–80k km).
• Engine oil leaks and turbo condition: inspect for oil leaks around the valve cover/rocker cover, listen for excessive turbo lag or whistling, and check for blue smoke on hard acceleration.
• Suspension and bushes (and AIRMATIC if fitted): check for knocks over bumps, rear multi‑link bush play, and any sagging or repeated compressor cycles if air suspension is installed.
• Infotainment, cameras and electrics: test COMAND/NTG boot behaviour, reversing camera, parking sensors, phone/Bluetooth and steering‑wheel controls for intermittent faults.
• Brakes, tyres and wheel‑arch/subframe corrosion: check for uneven pad/rotor wear, tyre condition and look under the arches and around the subframe for any corrosion or repaired damage.