2003 BMW 730 3.0L Diesel · N121 KSH

The BMW 730i’s MOT history presents a stable but concerning picture of recent neglect. The most recent test, conducted on 4 November 2025 at 112,491 miles, passed without defects, yet the preceding failure on 31 October 2025—just three days earlier—suggests the vehicle was only cleared after rectifying an unspecified issue not recorded in the official report. This pattern of a near-immediate retest hints at a last-minute fix rather than systematic maintenance, raising questions about what may have been overlooked. The absence of any advisories or defects across all five tests since 2022 implies no major structural or mechanical failures have been flagged by the tester, but the lack of recorded issues also means critical wear—such as suspension bush degradation, brake fluid condition, or exhaust emissions—could have been ignored. The clean MOT slips do not guarantee the car’s reliability; they merely indicate it met the minimum legal standards at the time of testing. The vehicle’s mileage of 112,491 over 23 years—averaging just 4,891 miles annually—is unusually low for its age, particularly given the BMW 7-Series’ typical usage profile. The stagnant mileage between May 2024 (112,480 miles) and November 2025 (112,491 miles) spans 17 months with only 11 miles covered, a stark indicator of prolonged inactivity. This suggests the car may have sat unused for extended periods, risking issues like seized bearings, degraded seals, or battery drain. The mileage drop from 103,940 in May 2022 to 112,480 by May 2024 (a 8,540-mile gap over two years) further supports this, though it could also reflect odometer tampering—a possibility worth investigating. The sparse MOT history, with only five tests in four years, raises further red flags, as a well-maintained luxury vehicle of this age and value would typically see more frequent checks, especially given its complexity. For a prospective buyer, the lack of recorded defects in the MOT history is deceptive; a thorough pre-purchase inspection must prioritise components rarely caught by basic MOT checks. The suspension—particularly the rear coil springs and bushings—should be scrutinised for wear or corrosion, as these are common failure points in high-mileage BMWs and may not always trigger an advisory. Binding or uneven brake performance, despite no MOT faults, could indicate worn pads, glazed discs, or seized calipers, especially given the car’s age and the potential for neglected fluid changes. Structural integrity is another critical area: check for corrosion in wheel arches, sills, and suspension mounts, as well as any signs of previous accident repair. The exhaust system, emissions compliance, and fluid levels (brake, coolant, power steering) should also be verified, as these are often deferred in low-mileage but poorly maintained vehicles. The battery’s health and the condition of the electrical system—including window regulators and door locks—are equally important, given the car’s prolonged periods of inactivity. Without a detailed service history, these checks are non-negotiable.