318d / 320d / 330d (B47 / B57 diesel)
2019–2024 · diesel · 1995cc · 190hp
Engine codes: B47, B57
Reliability, common problems and owner reviews for the Bmw 3 Series G20 318d / 320d / 330d (B47 / B57 diesel). Check this before you buy used.
The diesels are the high-mileage G20 choice — the 2.0 B47 (320d, often mild-hybrid — the robust engine that long ago replaced the chain-troubled N47) and the superb 3.0 straight-six B57 (330d). Both are strong, exceptionally economical and well-matched to the executive saloon/estate. Standard modern-diesel cautions: DPF and EGR on short trips (EGR cooler a known weak point), injector attention, twin-dosing AdBlue/SCR, and timing-chain checks at very high miles. The 330d straight-six is one of the best long-distance engines you can buy. A motorway-driven, serviced car is a genuine 300k long-hauler. Buy on EGR, DPF and AdBlue history.
Same engine, other cars
This is the same physical engine (N47) sold under different names across brands. Reliability is broadly shared — cross-check these:
- BMW 3 Series E90— 320d 2.0d (M47TU2, early)163hp
- BMW 2 Series— 216d / 218d / 220d (B37 / B47 diesel)190hp
- BMW 3 Series F30— 316d / 318d / 320d (N47 → B47)190hp
- BMW 4 Series— 420d / 430d (B47 / N47 / B57 diesel)190hp
- BMW 5 Series E60— 520d 2.0d (M47 → N47)177hp
- BMW X3— 2.0d (M47 / N47)177hp
- BMW X2— sDrive18d / 20d / xDrive20d (B47)190hp
- BMW X3— xDrive20d (N47)184hp
- BMW 1 Series E87— 116d / 118d / 120d (N47, 2007–2011)177hp
- BMW 5 Series G30— 520d / 530d / 540d (B47 / B57 diesel)190hp
- BMW 3 Series E90— 318d / 320d 2.0d (N47)177hp
- BMW X3 G01— xDrive20d / 30d (B47 / B57 diesel)190hp
- BMW X1— 18d / 20d / 23d (N47 diesel)184hp
Known Issues
EGR cooler weak point; DPF clogs on short trips; twin-dosing AdBlue/SCR.
Fix / Workaround: Replace EGR cooler; motorway regens; diagnose SCR.
Repair cost: €300–€1200
Typically appears after: 130,000 km
Injector and chain attention at very high mileage.
Fix / Workaround: Injector test; check chain.
Repair cost: €250–€1500
Typically appears after: 200,000 km
Mileage Thresholds
After 250,000 km: B47/B57 300k-capable with care.
Pre-Purchase Checklist
- ☐330d straight-six is superb
- ☐EGR cooler + DPF history
- ☐The engine for miles
Frequently asked questions
Is the Bmw 3 Series G20 318d / 320d / 330d (B47 / B57 diesel) reliable?
Maint. Sensitive — The diesels are the high-mileage G20 choice — the 2.0 B47 (320d, often mild-hybrid — the robust engine that long ago replaced the chain-troubled N47) and the superb 3.0 straight-six B57 (330d). Both are strong, exceptionally economical and well-matched to the executive saloon/estate. Standard modern-diesel cautions: DPF and EGR on short trips (EGR cooler a known weak point), injector attention, twin-dosing AdBlue/SCR, and timing-chain checks at very high miles. The 330d straight-six is one of the best long-distance engines you can buy. A motorway-driven, serviced car is a genuine 300k long-hauler. Buy on EGR, DPF and AdBlue history.
What are the common problems and reviews for the Bmw 3 Series G20 318d / 320d / 330d (B47 / B57 diesel)?
The most commonly reported problems: EGR cooler / DPF / AdBlue, Injector / timing chain (high miles).
Is a used Bmw 3 Series G20 318d / 320d / 330d (B47 / B57 diesel) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.