2025 BYD Seal U Comfort DM-I Phev Auto Hybrid electric (clean) · 84 DY

A lack of any DVSA MOT record means there is no independent verification of the Seal’s roadworthiness to date, leaving the mechanical condition entirely unconfirmed. Without a documented pass or advisory trail, you cannot rely on a pattern of stability or improvement; the vehicle simply carries an unknown history of compliance, which is a material risk for a prospective buyer. With mileage not disclosed, the usual benchmark of roughly 8‑12,000 mi per annum for a recent model cannot be applied, so wear on wear‑items such as tyre tread, brake pads and suspension bushings remains indeterminate. The absence of mileage data also prevents any assessment of whether the car has been subjected to high‑stress usage, such as frequent short trips that can accelerate high‑voltage battery cycling, or long‑haul cruising that would stress the drivetrain differently. Requesting a full service log or telematics read‑out is essential to establish a realistic usage profile before proceeding. Given the vehicle’s hybrid‑electric architecture, a thorough pre‑purchase inspection should focus on the high‑voltage battery pack, the inverter and electric motor for any signs of overheating, coolant leaks around the battery thermal management system, and the state of the regenerative‑brake integration. On a test drive, listen for any whine or grinding from the motor, feel for a juddering or loss of boost when the ICE engages, and watch the dashboard for warning lights related to battery state of charge or fault codes. Inspect the brake discs and pads for uneven wear that could indicate a fault in the regenerative‑brake blend, and check the suspension for play in the control arms or worn bushings that would be more evident under cornering loads. A full MOT‑type examination by a centre experienced with PHEVs is advisable, covering the high‑voltage safety interlocks, the charging inlet and cable, the exhaust after‑treatment system, and the conventional mechanical components such as steering rack, tie‑rod ends and wheel bearings. Verify that any outstanding BYD recall notices have been addressed, confirm the remaining warranty coverage on the battery, and ensure that the vehicle’s registration documents list a valid MOT expiry, as the absence of a historic record will otherwise leave you without a baseline for future compliance.