BMW 4 Series2021

• **Strong market demand and appreciation**: diesel 4 Series holding value well with 25% year-on-year gains; typical sell timeframe under 4 weeks suggests reliable buyer interest.
• **City driving is this engine's weak spot**: DPF and AdBlue heater failures common on short urban journeys; expect limp mode, warning lights, and bills of €600–€2,000 if soot buildup occurs.
• **Reliability concerns outweigh depreciation gains**: low 3/10 score reflects costly emissions-control issues; two recalls on record warrant checking service history for any outstanding work.
• **Before purchase, obtain full service record**: confirm DPF cleaning intervals logged, AdBlue heater replaced under warranty if applicable, and latest software updates applied to reduce sensor faults.
• **Mileage checks out**: median 82k km aligns with 5-year Irish usage; verify NCT status (due every 2 years from age 4) and motor tax band for diesel CO2 rating.

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