2004 AUDI A21.4L DIESEL

The vehicle remains roadworthy, but the maintenance trend shows a pattern of deferred repairs and recurring mechanical issues. The most recent test in September 2025 at 132,841 miles confirmed a persistent non-hazardous oil leak and a rear braking system that barely meets legal requirements. While the car passes, the recurring nature of the brake imbalance across 2024 and 2025 suggests the owner is performing minimum necessary maintenance rather than preventative servicing. The mileage profile is remarkably consistent for a 22-year-old vehicle, averaging approximately 6,000 miles per year. Between September 2021 at 112,705 miles and September 2025 at 132,841 miles, the car covered roughly 20,000 miles. This steady usage suggests regular operation rather than long periods of stagnation, which often helps keep seals lubricated though it also explains the age-related wear seen in the record. A buyer must prioritize a thorough inspection of the structural integrity of the chassis and lower components. The 2021 test flagged corrosion on the central front sub-frame, suspension arms, and rear coil springs. although the 2022 report noted the structural rigidity was not yet reduced, rust on these Audi components often progresses rapidly. A physical inspection should check for deep scaling on the sub-frame and mounting points to ensure the corrosion has not advanced beyond the point of safety. The braking system also requires immediate attention. The history of imbalanced rear brakes and pitted front discs as of 2024 indicates that the calipers may be sticking or the hydraulic system is struggling. Given the persistent oil leak and the low oil level noted in 2024, a mechanical check of the engine seals and sump is also necessary to ensure the leak is not affecting auxiliary components or indicating an imminent internal failure.