The 2011 BMW 535i is powered by a 3.0-liter turbocharged inline-6 engine known as the N55, delivering about 302 horsepower and roughly 332 lb-ft of torque. This represents the N55 generation that replaced the earlier N54 in the 5 Series lineup for that year.
This article explains the engine’s identity, how it differs from previous versions, and what buyers should know when evaluating a used 535i from that era.
Engine design and specifications
These are the core features of the 2011 535i’s powerplant and how it delivers performance.
- Engine code: N55B30
- Displacement: 3.0 liters
- Configuration: inline-6 (I6)
- Turbocharging: single twin-scroll turbocharger
- Fuel delivery: direct injection
- Valvetronic: variable valve timing and lift
- Power output: approximately 302 horsepower
- Torque: around 332 lb-ft (approximately 450 Nm)
In practice, this setup provides strong mid-range torque and smooth, linear power delivery characteristic of BMW’s turbocharged inline-6s. The N55 integrates Valvetronic and direct injection to optimize efficiency and responsiveness.
Engine history in the 5 Series family
This engine is part of a transition in the 5 Series lineup. Some earlier models used a different twin-turbo engine, and the 2011 model year consolidated to the N55 in most markets.
- E60 535i (2008–2010): uses the N54 twin-turbo 3.0-liter inline-6, typically rated around 302 horsepower with torque in the low-to-mid 300s lb-ft.
- F10/F11 535i (2010–2013/2011–2013 in some markets): uses the N55 single-turbo 3.0-liter inline-6, with similar horsepower but improved mid-range torque and efficiency.
Overall, the 2011 535i represents the N55 generation, offering efficient performance with a broad torque curve compared with its predecessor.
Buying tips and maintenance considerations
When shopping for a used 2011 535i or maintaining one, consider these points.
- Check service records for turbo and fuel system maintenance. While the N55 is robust, regular maintenance affects reliability and performance.
- Direct injection engines can accumulate carbon buildup on intake valves; inquire about maintenance history or potential cleaning if performance has degraded.
- Inspect for unusual turbocharger or vacuum-system noises and ensure the engine runs smoothly at startup and during acceleration.
- Monitor oil consumption and look for oil leaks around the valve cover gasket or oil filter housing, which are common areas in older BMW inline-sixes.
With proper service history and maintenance, the N55-powered 2011 535i offers a refined, strong-driving experience with the efficiency improvements BMW pursued during that era.
Summary
The 2011 BMW 535i uses a 3.0-liter turbocharged inline-6 engine, the N55, delivering about 302 horsepower and roughly 332 lb-ft of torque. It marks a shift from the prior N54 setup and pairs with BMW’s modern tech like direct injection and Valvetronic. When shopping used, focus on maintenance history, potential carbon buildup, and turbo-system wear to ensure long-term reliability.