This is the G20-generation 3 Series (2019‑on) in diesel/automatic form — most Irish examples will be the 2.0-litre 320d with the ZF 8-speed automatic. Diesel BMWs of this era use DPF and AdBlue systems, so they perform best on longer runs; the gearbox is smooth but benefits from documented fluid/service history. Expect BMW-level running costs (parts and servicing pricier than mainstream brands) but good parts availability and strong market demand for saloon variants.

• DPF behaviour: watch for frequent regenerations, warning lights or heavy smoke after hard acceleration (sign of soot build-up if car has been used for short trips).
• AdBlue system: confirm filler cap and dosing system work, and check for dashboard faults related to AdBlue or SCR.
• Automatic gearbox operation: ensure shifts are crisp with no hesitation, hunting or shuddering from cold and under load (ZF 8HP should be smooth).
• Turbo and boost response: check for whistling, lag or excessive smoke under acceleration which can indicate turbo or intake leaks.
• Suspension and tyre wear: inspect for uneven tyre wear or worn bushes/anti-roll linkages—sport packs can show firmer wear and inner-edge tyre wear if alignment is off.