2021 BMW 840I M Sport Auto 3.0L Petrol · N70 SAU

The most recent MOT, carried out on 3 August 2026, was passed but recorded an advisory that the off‑side front tyre is slightly damaged. Over the preceding two‑year period the vehicle has shown a mixed picture: a failure in June 2024 was driven by a major cut on the off‑side front tyre and a cut on the near‑side rear tyre, yet the subsequent tests in 2024, 2025 and 2026 have all passed, albeit with lingering tyre advisories. This indicates that the underlying mechanical condition of the car has stabilised, but tyre health remains a recurring concern that has yet to be fully resolved. At 49,878 miles the BMW 840i M Sport is roughly five years old, giving an average annual mileage of just under 10,000 miles. This figure sits comfortably within the typical usage envelope for a premium executive saloon and suggests the car has not been subjected to excessive wear through high‑frequency short‑haul or aggressive driving. There are no obvious gaps in the recorded mileage, implying regular use rather than long periods of storage, which reduces the risk of age‑related degradation such as rubber perishing or battery sulphation beyond what is normal for a vehicle of this age. Prospective buyers should give particular attention to the tyre set. The off‑side front tyre, flagged as slightly damaged, may be developing sidewall cracks, bulges or tread separation – symptoms that can manifest as a soft thump, vibration or a pulling sensation when cornering. The near‑side rear tyre, noted as having a cut, should be inspected for any progression of the damage; even a shallow cut can allow moisture ingress and lead to internal ply corrosion. It is advisable to verify that all four tyres are of the same brand, model and wear depth, and to have a professional wheel‑balancing and alignment performed after any replacement, as mismatched tyres or misalignment can accelerate suspension bush wear and cause uneven tyre wear patterns. Beyond the tyres, the car’s age warrants a thorough check of time‑sensitive components. The 12‑volt battery should be tested for cranking amperage and electrolyte level, as a five‑year‑old unit may be approaching the end of its service life, especially if the vehicle has spent periods idle. Brake discs and pads should be examined for surface glazing, rust spots or scoring, with particular focus on any vibration or pulsation felt under braking. Fluid condition – engine oil, coolant, brake fluid and gearbox oil – should be verified against service records; many manufacturers recommend fluid replacement at the ten‑thousand‑mile mark or every two years, whichever comes first. Finally, inspect the suspension bushings, coil springs and steering rack for any audible clunks, excessive play or uneven tyre wear that could indicate early wear, and confirm that the service book contains regular oil changes and any required software updates for the M‑Sport electronics.