The first-generation Peugeot 508 (codename 8D for the sedan, 8E for the SW estate) had the challenging task of simultaneously replacing the 407 and 607. Positioned as a prestigious executive car, it marked a significant move upmarket for Peugeot with meticulous finish, advanced sound insulation, and first-class road handling. GT versions even feature a double wishbone front suspension with a decoupled pivot, offering exceptional driving precision. The model received a facelift (Phase 2) in late 2014, introducing a more vertical grille, new LED lights, a touchscreen, and updated engines (BlueHDi and THP 165) to meet the Euro 6 standard. While its road qualities are undeniable, its overall reliability is mixed: excellent on 2.0 HDi engines, but marred by the woes of the 1.6 THP (before 2014)
The Peugeot 508 I is an excellent executive car that offers above-average driving pleasure for its category. However, its reliability record requires careful selection. The absolute best buy is the 2.0 HDi (140 or 163 hp), an indestructible engine that lasts for years without issues. Facelifted versions (Phase 2) are more modern, but the introduction of BlueHDi engines comes with the almost systematic risk of AdBlue tank failure (expect 1000 to 1500€ for repair if not covered). On the petrol side, avoid the THP 156 and opt for the THP 165, which is much better designed. Finally, avoid the Hybrid4 engine, whose complexity and BMP6 gearbox spoil the experience and threaten your wallet.