The 2021 A8 is the D5-generation large Audi saloon and most petrol A8s of this year use a 48V mild‑hybrid system (starter‑generator and small battery) rather than a plug‑in chargeable battery — there is usually no external charge port. Expect a ZF automatic gearbox and available adaptive air suspension on many cars; both give a very smooth ride but can be costly to repair. Servicing and parts are widely available in Ireland through Audi dealers and independent specialists, but labour and parts costs are higher than for mainstream models.

• 48V hybrid system health — ask for a diagnostic/battery state check (starter‑generator voltage and fault history) and confirm there is no recurring hybrid warning light
• Air suspension operation — listen for a running compressor, check ride height front/rear and inspect for sagging or unevenness
• Automatic gearbox service history — confirm fluid/software service done (A8 automatics are expensive to rebuild if neglected)
• Electrical and infotainment functionality — test cameras, parking sensors, adaptive cruise, MMI menus and any driver-assist features for glitches
• Signs of heavy chauffeur or executive use — rear seat wear, seat heating/ventilation functions, and larger L (long-wheelbase) body panels or aftermarket partition fitments