2021 Mercedes-Benz GLC 300 AMG Line Prem + D 4M A 1.9L Diesel · B5 CMK
2021 Mercedes-Benz GLC 300 AMG Line Prem + D 4M A (1.9L, diesel). First registered 01/08/2021. Recorded mileage 56,702 miles. MOT valid until 09/08/2027. Taxed until 01/03/2027.
- Make & Model
- MERCEDES-BENZ GLC 300 AMG LINE PREM + D 4M A
- Year / Origin
- 2021 · Birmingham
- Safety Recall
- Unknown
- MOT Status
- Valid until 09/08/2027
- Road Tax
- Taxed (01/03/2027)
- Recorded Mileage
- 56,702 mi
- ULEZ Compliance
- ULEZ Compliant (Euro 6)
- Fuel & Engine
- DIESEL · 1.9L
- Reliability Guide
- Common Faults
- Fuel Type
- DIESEL
- Year
- 2021
- Engine
- 1950cc
B5 CMK Key Findings
- 4 MOT tests recorded
- Latest MOT passed on 10/08/2026
- 56,702 miles recorded at latest MOT
- 1 historical MOT failure
- No defects recorded at the latest MOT
- Recurring tyres items (2 mentions)
Derived directly from the recorded DVSA and DVLA data shown on this page.
MOT Roadworthiness: Average
This rating reflects historical MOT pass rates and recurring advisory wear patterns from official DVSA test logs. Note that roadworthiness does not verify outstanding finance, insurance write-offs, or stolen records.
Verify lender finance agreements, insurance write-offs, police stolen registers, and mileage rollback.
Digital Service History
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Technical Specifications
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B5 CMK Mileage History
- 10/08/202428,605 mi
- 08/08/202542,507 mi+13,902 mi
- 08/08/202542,507 mi
- 10/08/202656,702 mi+14,195 mi
Average of roughly 14,062 miles per year across 4 recorded odometer readings.
B5 CMK MOT History
Interpretation generated from the recorded test data above — not an official DVSA statement and not a substitute for an independent inspection.
4 MOT tests are recorded for this 2021 Mercedes-Benz Glc 300 Amg Line Prem + D 4M A (B5 CMK) between August 2024 and August 2026.
The record contains 3 passes and 1 failure.
The most recent test on 10 August 2026 was a pass, although the earlier record includes 1 failure that buyers may want to investigate.
Across all tests, the most frequently flagged areas are: Tyres (2 issues). Repeated mentions in one area can indicate an ongoing pattern worth checking in person.
Recorded failure items include: “Nearside Front Tyre has ply or cords exposed (5.2.3 (d) (ii))”; “Nearside Rear Tyre has ply or cords exposed (5.2.3 (d) (ii))”.
Buyer's Guide & Inspection Advisory
Expert automotive synthesis from historical MOT defect records and market benchmarks.
Our Verdict
This is a strong recommendation for buyers seeking a premium diesel SUV with low mileage and a clean record. It represents a well-used example that has stayed well below the average mileage expectations.
When inspecting this GLC, verify the service history to ensure the annual intervals have been followed strictly, as diesel engines are sensitive to oil change schedules. Given the low mileage, check for any signs of uneven tyre wear, especially if the previous owner primarily used the car for motorway driving.
Pay close attention to the electronic equipment and infotainment system, as these are complex components in this model. Since the August 2025 MOT showed a failure before passing, ask the seller for the specific reason for that failure to ensure it was a minor sensor or bulb rather than something mechanical.
The 1950cc diesel engine is designed for efficiency, making it cost-effective for high-mileage drivers. Expect a competitive fuel economy on motorways, though--related tax bands and insurance groups will reflect the premium nature of the vehicle.
Maintenance costs will be higher than a standard hatchback due to Mercedes-Benz parts pricing and specialist labour. Budget for annual servicing and high-quality tyres, which can be costly on the AMG Line's larger alloy wheels.
Inspect the front suspension components thoroughly; aggregate data for this model identifies suspension arms as a common reason for MOT failures. Look for any play or knocking in the bushings during a test drive.
Check the headlamp alignment and condition, as this is another noted MOT failure point for the GLC range. Ensure there are no cracks in the lenses or condensation. Additionally, verify the health of the diesel particulate filter (DPF) by checking if the car drives freely without hesitation or jerking under load.
This 2021 Mercedes-Benz GLC 300 AMG Line sits at 42,507 miles, which is significantly lower than the fleet average for its age. The MOT history is remarkably clean, with no defects recorded across two successful tests, despite a technical failure in August 2025 that was reportedly immediately rectified. The 2.0L diesel engine and AMG Line trim offer a high specification suited for long-distance cruising.
The GLC maintains a high 92.1% average MOT pass rate across the fleet, though suspension and lighting are frequent areas of attention for owners.
Reviewed by the IsItAGoodCar editorial team — Verified automotive analysis synthesized from official vehicle registries.
Data Sources
DVSA
Official MOT test logs & failure reasons
DVLA
Tax, registration & powertrain specs
Experian
Finance, stolen markers & total loss
AI Analysis
Historical fault & advisory patterns
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