IMPORTANT CLARIFICATION: There is no diesel engine (nor any internal combustion engine) for the Tesla Model X. It has been a 100% electric vehicle (BEV) since its launch. The first-generation Tesla Model X is a large luxury family SUV, famous for its articulated rear doors known as "Falcon Wing" doors, its giant panoramic windshield, and its blistering acceleration. While it revolutionized the electric SUV segment with its range, its Supercharger network, and its over-the-air (OTA) updates, it was also plagued by major early production flaws. Its extremely complex design (motorized doors, onboard electronics) led to numerous reliability issues on the early model years (2016-2018). The "Raven" technical update (mid-2019) greatly improved efficiency and suspension comfort.
The Tesla Model X is a spectacular vehicle, but its mechanical and electronic reliability in the early years (2016-2018) falls far below luxury standards. The Falcon doors are a source of costly breakdowns, as are the front half-shafts and the MCU1 screen. It is imperative to avoid the 90D models (battery degradation) and favor the 100D versions. The best choice remains a "Raven" version (mid-2019 to 2021), which is much more refined, efficient, and reliable. Ensure that hardware recalls have been performed and that the battery/motor warranty (8 years, unlimited mileage or 240,000 km depending on the year) is still active.