Engine
BMW B47 vs B48
BMW diesel vs petrol used-buy comparison covering reliability, running cost, inspection risk, and ownership fit.
BMW B47
74
/ 100
BMW B48
78
/ 100
Best used buy
BMW B48
B48 for lower emissions complexity and fewer diesel-use-pattern risks; B47 for high-mileage motorway use with clean EGR/DPF evidence.
The B48 is usually the easier private used buy because cooling, oil, PCV, and ignition issues are simpler to inspect than diesel emissions health. The B47 still makes sense for long-distance drivers who can keep the DPF healthy.
Key differences
- B47 is stronger on fuel economy and torque for motorway mileage.
- B48 avoids DPF, EGR cooler, NOx, and diesel short-trip exposure.
- B47 purchase quality depends heavily on EGR campaign history and DPF scan data.
- B48 inspection should focus on cooling leaks, PCV behavior, misfires, and oil seepage.
Buyer advice
- Pick B47 only when the car has regular long runs and verified emissions health.
- Pick B48 when you want lower diagnostic uncertainty and mostly mixed urban driving.
- For either engine, shorten oil intervals and inspect coolant loss before buying.
Red flags
- Coolant loss
- Stored emissions faults
- Rough cold idle
- تسرب النفط
- Seller refuses scan