2026 BYD Seal U Boost DM-I Phev Auto 1.5L Hybrid electric · ML26 PLN

At the time of this assessment dated 1 September 2026, there is no DVSA MOT history available for this vehicle. As the BYD Seal U Boost DM-i PHEV was registered in 2026, it would not yet be required to undergo its first MOT test until the third anniversary of its registration date, meaning the absence of MOT records is entirely consistent with the vehicle's age rather than indicative of any concerning history. Without any recorded test outcomes, advisories, or failure points, it is not possible to evaluate a maintenance trend; however, the clean record at this early stage is positive and simply reflects that no statutory roadworthiness examination has yet been performed on the vehicle. With recorded mileage listed as unknown and no MOT data to corroborate usage patterns, it is not possible to calculate an annual mileage rate or identify any gaps or rapid accumulation that might raise mechanical concerns. Prospective buyers should therefore request the current odometer reading directly from the seller and, where possible, verify it against any available service invoices, digital service records within the BYD app or infotainment system, or V5C registration certificate. For a 2026 registration, even relatively modest annual mileages in the range of six to ten thousand miles would be reasonable for a plug-in hybrid vehicle of this type, but any figure significantly outside the expected range should prompt further questioning regarding usage history, particularly if the vehicle has been used predominantly for short urban journeys which can place different demands on the high-voltage battery and combustion components compared to mixed or longer-distance driving. Given that no MOT advisory or defect history exists, buyer guidance must centre on age-appropriate and technology-specific physical checks that would not necessarily be flagged at this early stage. The tyres, despite potentially retaining substantial tread depth due to low mileage, should be inspected carefully for sidewall perishing and cracking caused by age rather than wear, as rubber compounds degrade over time regardless of use. The 12V auxiliary battery, the high-voltage traction battery state of health, brake discs and calipers should be examined for surface corrosion and any signs of binding that can develop during periods of standing, particularly given the regenerative braking system employed on this PHEV which may result in the mechanical brakes being used less frequently and therefore being more susceptible to corrosion. A thorough test drive should include listening for any suspension clonks over uneven surfaces, checking for brake shudder or pulling under retardation, and verifying smooth transitions between electric and hybrid propulsion modes as well as the operation of the charging system. Additionally, although this vehicle is still within its manufacturer warranty period, buyers should verify the presence of any service history stamps or digital records, as BYD typically recommends initial inspections at twelve months or ten thousand miles for plug-in hybrid models. All fluids, including brake fluid, coolant, and the transmission fluid for the hybrid drivetrain, should be confirmed as within manufacturer service intervals, with attention drawn to any evidence of leaks from the underbody or around the high-voltage orange cabling. The exhaust system, although used less frequently in EV mode, should still be inspected for corrosion and security of mounting. Finally, a diagnostic scan using BYD-compatible equipment is highly recommended to identify any stored fault codes within the battery management system, hybrid control unit, or driver assistance systems, as such faults would not be captured in the MOT history and would only become apparent through electronic interrogation of the vehicle's onboard systems.