2019 Mercedes-Benz GLC 300 AMG Line Prem + D 4M A 2.0L Petrol · RO69 BOH

The mechanical narrative of this GLC 300 is one of an initially clean roadworthiness record that has progressively accumulated brake and tyre-related advisories as mileage has built. The earliest two tests on file, from September 2022 and October 2023, returned no advisories or defects, suggesting the vehicle was in sound condition at that point. By October 2024 the pattern shifted, with front brake pads noted as wearing thin alongside brake disc wear advisories on the nearside and offside front, plus the nearside rear. The most recent test in November 2025 then escalated the picture, with all four brake discs now flagged as worn and a nearside front tyre recorded as worn close to the legal limit. The overall trend is therefore one of increasing wear rather than stable condition, although the test outcomes remain pass results with no failures recorded, no corrosion advisories on structural items, and no flagged exhaust, suspension, or lighting defects across the four-year MOT history. The recorded mileage of 122,804 over a roughly seven-year lifespan equates to an annual accumulation of approximately 17,500 miles, which sits well above the average mileage for a vehicle of this age. This high annual usage has direct mechanical implications, particularly for the consumable braking components that the MOT record already identifies, and would also be expected to accelerate wear on clutch, dual-mass flywheel, turbocharger bearings, suspension bushes, coil springs, and drivetrain mounts on a vehicle of this specification. There are no extended testing gaps in the record that would suggest long periods off the road, and the consistent year-on-year testing aligns with a vehicle in regular service. Buyers should be aware that high-mileage diesel SUVs of this generation are also subject to issues with diesel particulate filter regeneration cycles, AdBlue system components, and injector wear, none of which are visible from MOT data alone but which warrant specific attention on a pre-purchase inspection. Given the repeated front and rear brake disc advisories across the 2024 and 2025 tests, a prospective buyer should carry out a measured test drive paying close attention to brake pedal feel, looking out for any judder or vibration through the steering wheel under firm braking, which would indicate disc runout or uneven wear. Listen for grinding, squealing, or scraping noises on light application, and watch for any pulling to one side which could suggest a binding caliper. Given the nearside front tyre advisory at the most recent test, inspect all four tyres for uneven shoulder wear, which on a 4Matic all-wheel-drive vehicle can point to geometry, suspension bush, or anti-roll bar link issues, and check the nearside front specifically for inner-edge wear that may not be visible from above. The vehicle should be driven over varied road surfaces including speed bumps and broken tarmac to listen for clonks, rattles, or knocking from the front suspension, which on a high-mileage Mercedes of this era commonly originates from worn lower control arm bushes, anti-roll bar drop links, or top mount bearings. Beyond the items flagged on the MOT record, a thorough pre-purchase inspection should include a borescope examination of the bores for oil consumption evidence, a compression or leak-down test on the diesel engine, and a check for oil leaks from the front crank seal, turbo oil feed and return lines, and the commonly affected oil cooler gasket on the OM654 engine. The 9G-Tronic automatic gearbox should be tested with a full cold-to-hot temperature cycle, checking for hesitation, harsh downshifts, or any torque converter shudder under light throttle. A diagnostic scan should be performed for stored fault codes relating to the AdBlue system, NOx sensors, diesel particulate filter, and the 4Matic transfer case, as these are known cost-intensive failure points on high-mileage GLC diesels. Underneath, the vehicle should be raised to inspect the subframe, brake lines, and suspension arms for any corrosion or perishing rubber, and the exhaust system should be checked for mid-section corrosion around the DPF and mounting points. Any history of replacement brake discs and pads should be requested, as the recurring disc advisories suggest they may be approaching the end of their second or third set of wear.