2015 Audi A6 3.0L Diesel · SN65 CTJ

The 2015 Audi A6 presents a mixed but broadly stable maintenance picture as of its most recent MOT pass on 17 April 2026 at 75,997 miles. The vehicle passed that test, yet the tester flagged worn lower suspension arm pins or bushes on both front corners and noted corrosion on the rear sub-frame, albeit without serious structural weakening. These advisories suggest the car is roadworthy today but entering a phase where front suspension bush wear and underbody corrosion deserve closer scrutiny. The maintenance trend is neither sharply worsening nor clearly improving; it reflects a typical pattern of aging wear on a well-used executive saloon. Mileage accumulation sits at roughly 6,900 miles per year, which is typical for this age. The record shows a gap between April 2022 at 66,005 miles and April 2024 at 70,990 miles, representing about 4,985 miles over two years, a slightly lighter use period. From April 2024 to April 2026 the car added 5,007 miles in two years, maintaining a steady pace. No single leap in mileage stands out as suspicious, and the overall progression is consistent with regular daily use rather than long periods of neglect or sudden high-mileage runs. The recurring theme across the MOT history is tyre wear. In May 2025 at 71,290 miles all four tyres failed with tread below the 1.6mm legal limit, and in April 2024 at 70,990 miles all four were flagged as worn close to the legal limit or worn on edge. This pattern suggests the previous owner delayed replacements until the last possible moment. A buyer should inspect tyre condition and alignment carefully, as uneven edge wear can point to suspension geometry issues or worn tracking. The front lower suspension arm bush wear noted in April 2026 reinforces that possibility and warrants a physical check for play and clunking over bumps. Beyond tyres, the rear sub-frame corrosion advisory has appeared in both April 2024 and April 2026. While the tester judged it not seriously weakened on both occasions, corrosion in this area can progress with age and winter salt exposure. A buyer should have the underbody, sub-frame mounting points, and suspension mounting points inspected for deeper pitting or flaking, especially before winter. The May 2025 failure also included ABS, stability control, and airbag warning lamps, which cleared before the subsequent pass. Any reappearance of those dashboard warnings would indicate an unresolved electrical or sensor fault that needs diagnostic attention before purchase.