xDrive30d / 35d (N57)
2010–2017 · diesel · 2993cc · 258hp
Engine codes: N57
Reliability, common problems and owner reviews for the Bmw X3 xDrive30d / 35d (N57). Check this before you buy used.
The N57 straight-six diesel is the X3's premium engine — strong, smooth and far more dependable than the N47, with a timing chain that doesn't share the four-cylinder's failure reputation. It's the one to choose for big mileage. Watch the EGR cooler (a known BMW diesel item), DPF on short trips, and high-mileage turbo/injection. Thirstier and pricier to service, but a documented N57 is a genuinely durable powertrain.
Same engine, other cars
This is the same physical engine (M57) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
EGR cooler can leak/clog (known BMW diesel issue).
Fix / Workaround: Replace EGR cooler; check for coolant loss.
Repair cost: €300–€1200
Typically appears after: 150,000 km
DPF on short trips; turbo and injectors at high mileage.
Fix / Workaround: Motorway regens; check turbo/injectors.
Repair cost: €300–€1600
Typically appears after: 200,000 km
Mileage Thresholds
After 250,000 km: Durable six with care.
Pre-Purchase Checklist
- ☐The robust diesel six — preferred over 20d
- ☐EGR cooler + DPF history
- ☐Pricier servicing
Frequently asked questions
Is the Bmw X3 xDrive30d / 35d (N57) reliable?
Maint. Sensitive — The N57 straight-six diesel is the X3's premium engine — strong, smooth and far more dependable than the N47, with a timing chain that doesn't share the four-cylinder's failure reputation. It's the one to choose for big mileage. Watch the EGR cooler (a known BMW diesel item), DPF on short trips, and high-mileage turbo/injection. Thirstier and pricier to service, but a documented N57 is a genuinely durable powertrain.
What are the common problems and reviews for the Bmw X3 xDrive30d / 35d (N57)?
The most commonly reported problems: EGR cooler, DPF / turbo / injection (high miles).
Is a used Bmw X3 xDrive30d / 35d (N57) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.