Peugeot 508 I (8D) (2010 – 2018)

Reliability score : 7.1/10

The Peugeot 508 Generation I (8D for sedan, 8E for SW estate, and RXH) was introduced to replace both the aging 407 and the executive 607. It marked a significant step up in perceived quality, interior space, and refinement for the French brand. Built on the PSA PF3 platform, it offers an exceptional balance between ride comfort and dynamic handling, a hallmark of Peugeot. A major facelift (Phase 2) occurred in 2014, bringing a more vertical grille, full LED headlights on higher trims, an updated touchscreen infotainment system (SMEG+ replacing the laggy RT6), and the introduction of Euro 6 compliant engines (BlueHDi and updated THP). While the chassis is universally praised, the 508's reliability is highly dependent on the chosen powertrain. The early petrol engines (Prince family) and th

✅ Strengths

Exceptional ride comfort and sound insulation
High-quality interior materials (especially post-2014)
Outstanding 2.0 HDi engines (pre-BlueHDi are bulletproof)
Huge cargo capacity in the SW (Estate) version
Elegant and timeless exterior design (Phase 2)
GT version features a superior double-wishbone front suspension

⚠️ Weaknesses

Disastrous reliability of the early 1.6 THP 156 engine
Widespread AdBlue tank failures on all BlueHDi models
BMP6 / ETG6 automated manual gearbox is jerky, slow, and wears clutches quickly
Lack of interior storage spaces (tiny cupholders, small door bins)
Outdated and laggy infotainment system on Phase 1 models (RT6)
Heavy weight affects agility compared to the older 407

🎯 Verdict

The Peugeot 508 I is a fantastic long-distance cruiser that can be either a dream or a nightmare depending entirely on the engine and gearbox combination. To Buy: The absolute best choice is the 2.0 HDi (140 or 163 hp) from the Phase 1 era, paired with the manual or the Aisin 6-speed automatic. It is incredibly reliable. The later 2.0 BlueHDi (150/180 hp) is also excellent, provided the AdBlue tank has already been replaced with the updated version. To Avoid: Flee from the 1.6 THP 156 (endless timing chain and turbo issues) and absolutely avoid any model equipped with the BMP6 / ETG6 automated manual gearbox (often found on 1.6 e-HDi and 1.6 VTi), which ruins the driving experience and is prone to expensive clutch wear.