B48B20 engine
The B48B20 engine is fitted to 5 generation(s): BMW 5 Series, BMW 3 Series, BMW X3.
Common problems and what to check
Engine: BMW B46/B48/B58
- oil and coolant leaks at high mileage
- water pump failures occur
What to check when buying: oil traces; service history.
Tip: Noticeably more reliable than previous generations.