2020 Mercedes-Benz GLC 300 AMG Line Prem D 4M A 1.9L Diesel · D24 BAM

The GLC 300 diesel typically achieves around 45 mpg, translating to roughly £700‑£850 per year for fuel assuming 10,000 miles of annual use and current diesel prices. Road tax for a 2020 diesel in band 4 is about £210 per year, and the insurance group sits around 30, leading to an annual premium of £600‑£800 depending on driver profile.

Maintenance on a premium Mercedes can be higher than mainstream models; brake disc and pad replacement, tyre changes, and routine servicing may run £400‑£600 annually. Adding fuel, tax and insurance, a realistic estimate for total running costs sits between £1,200 and £1,500 per year.

Inspect the front headlamp alignment and washer system to confirm the issue flagged in the May 2026 MOT has been rectified; misaligned headlights can cause safety concerns and further MOT failures. Examine the front and rear brake discs and pads for wear, as the 2025 MOT noted thin pads and discs approaching wear limits; replacement may be imminent.

Check all four tyres for tread depth, especially the front tyres which were reported as worn close to the legal limit in 2025, and look for any embedded objects such as the rear nail previously identified. Verify that the tyre condition meets legal requirements and assess whether a set of new tyres will be needed soon.

Review the overall condition of the windscreen washer jets and fluid lines, given that windscreen washer failure was a recorded MOT defect. Ensure the jets are functional and the system delivers adequate spray, as this is a common failure point for the model.