2017 Mercedes-Benz GLC 2.1L Diesel · KF17 FFS

The 2017 Mercedes-Benz GLC presents a mixed maintenance picture. The most recent test on 24 February 2026 at 77,785 miles resulted in a pass, but only after a failure four days earlier on 20 February 2026 at 77,713 miles. That failure was triggered by both rear tyres falling below the 1.6mm legal tread depth minimum, a basic consumable issue that suggests routine checks were overlooked. The pass on the 24th confirms the tyres were replaced, yet the same advisory for worn brake discs front and rear carried over from the failure to the retest, indicating the discs were noted but not replaced. The nearside front lower suspension arm ball joint dust cover was also flagged as severely deteriorated in both February 2026 tests, a recurring item that first appeared in the September 2024 failure when the ball joint itself was excessively worn. This points to a worsening suspension wear pattern rather than a one-off defect. The mileage progression tells a fairly consistent story. From the September 2023 pass at 59,490 miles to the September 2024 failure at 66,625 miles, the vehicle covered 7,135 miles in twelve months. The jump from September 2024 to February 2026 at 77,713 miles represents 11,088 miles in roughly seventeen months, a slightly elevated rate but not extreme for a vehicle of this type. The annualised figure of approximately 8,643 miles aligns with typical use for a nine-year-old GLC. There are no alarming gaps in the record that would suggest long periods of inactivity or clocking concerns. A buyer should focus their physical inspection on three areas. First, the front lower suspension arm and ball joint assembly on the nearside requires close examination, given the progression from a deteriorated dust cover in February 2026 back to an excessively worn joint in September 2024, which implies water and debris ingress has been ongoing. Second, the braking system needs measuring. Worn discs appearing as advisories across both February 2026 tests suggest the vehicle has been driven with discs at or near minimum thickness for some time, and the calipers and pads should be inspected for uneven wear or binding. Third, the rear tyres should be checked for age-related cracking and perishing, a fault noted in both the February 2025 and September 2024 tests, which indicates the rears may have been neglected or left on older rubber despite tread depth being addressed for the recent retest.