2005 BMW 650 4.8L Petrol · BG55 AAZ

The most recent MOT test on 8 December 2025 resulted in a pass, but the overall maintenance history indicates a pattern of recurring issues rather than a strictly stable trend. There has been a persistent advisory regarding the corrosion of the nearside front brake pipe appearing across multiple tests since early 2024, and a significant failure in December 2025 due to a fractured nearside rear coil spring. While the vehicle is currently compliant, the repeated mention of brake line degradation suggests that while specific components are being addressed, the overall health of the hydraulic lines requires close monitoring to prevent future major failures. With 85,670 miles recorded over 21 years, the vehicle has averaged approximately 4,080 miles per year. This represents very low annual usage, which can be a double-edged sword for a high-performance vehicle. While the engine and drivetrain may have relatively low mechanical wear, such low mileage often implies the vehicle has spent significant time stationary. This increases the likelihood of age-related degradation in rubber-based components, such as seals, bushes, and hoses, which can perish from lack of use and thermal cycling rather than physical wear. During a test drive, particular attention must be paid to the braking system and suspension. Given the history of brake pipe corrosion and the recent failure of a coil spring, you should listen for any metallic clunks or knocks from the suspension when traversing uneven surfaces, which could indicate failing bushes or worn springs. Regarding the brakes, check for a firm, consistent pedal feel; any sponginess or a pulsating sensation through the pedal could indicate air ingress or further degradation within the hydraulic lines. You should also inspect the brake pipes closely to ensure that any grease or covering material used to mask corrosion is not hiding significant structural decay. Due to the low mileage and age, a thorough physical inspection of consumables is essential. Inspect the tyres for sidewall cracking or perishing, as even if the tread is deep, the rubber may have lost its elasticity due to age. Check the 12V battery's condition and look for signs of fluid leaks from engine or transmission seals, which can dry out and fail on vehicles that are not driven regularly. Furthermore, ensure the service history reflects time-based maintenance, such as annual oil changes and brake fluid replacements, as these are more critical for low-mileage vehicles than mileage-based intervals to prevent internal corrosion and fluid breakdown.