If you do go for the 508 Hybrid, reliability promises to be good. While the 508 is too new to have been included on owner surveys just yet, the closely related 3008 has been rated highly in ownership surveys. You also get that three-year, unlimited mileage warranty, while the battery is covered by an eight year, 100,000 mile warranty that also protects against performance loss if the car’s maximum range drops below 70% of what it was when new.
Believe it or not, there was a diesel-electric hybrid Peugeot 508 in the last generation, which was sold between 2010 and 2018. Very few were sold, and even fewer are available on the used market, but they are out there. These four-wheel drive 508s were not plug-in hybrids but were ‘full’ hybrids like those in Toyota and Lexus models, only with a diesel engine. They offered very little pure electric running and didn’t offer the sort of real-world economy you’d expect so we wouldn’t recommend it as a used buy.