BMW N55 Engine Specifications
The BMW N55 engine is a notable inline-six engine that has gained popularity for its performance and efficiency. Introduced in 2009, the N55 is a turbocharged engine that has been used in various BMW models, including the 335i, 535i, and several others. Below are the detailed specifications of the N55 engine.
| Specification | Details |
|---|---|
| Engine Type | Inline-six, turbocharged |
| Displacement | 3.0 liters (2,998 cc) |
| Bore x Stroke | 84.0 mm x 89.0 mm |
| Compression Ratio | 10.2:1 |
| Power Output | 225 hp (168 kW) at 5,800 rpm |
| Torque | 300 lb-ft (407 Nm) at 1,300 – 5,000 rpm |
| Fuel System | Direct injection |
| Turbocharger | Single twin-scroll turbocharger |
| Fuel Type | Premium unleaded (91 octane or higher) |
| Weight | Approximately 170 kg (375 lbs) |
Engine Configuration
The N55 engine features a robust design that emphasizes performance and reliability. Here are some key aspects of its configuration:
Key Features
- Inline-six configuration, which provides smooth power delivery and balance.
- Single twin-scroll turbocharger that enhances responsiveness and reduces turbo lag.
- Direct fuel injection system that improves fuel efficiency and power output.
- Aluminum alloy engine block and aluminum DOHC cylinder head for weight reduction.
- Variable valve timing (VANOS) for optimized performance across different RPM ranges.
Performance Characteristics
- Rapid acceleration due to high torque availability from low RPMs.
- Excellent throttle response thanks to the turbocharger design.
- Balanced handling characteristics due to the engine’s low center of gravity.
Engine Oil Specifications
Proper engine oil is crucial for the longevity and performance of the BMW N55 engine. Below are the recommended oil specifications:
| Specification | Details |
|---|---|
| Oil Type | Synthetic oil |
| Viscosity Grade | SAE 0W-30 or 5W-30 |
| Oil Capacity | Approximately 6.5 quarts (6.2 liters) |
| Oil Change Interval | Every 10,000 miles (16,000 km) or 12 months, whichever comes first |
Service Intervals
Regular maintenance is essential for keeping the N55 engine running smoothly. Below are the recommended service intervals:
Maintenance Schedule
- Oil Change: Every 10,000 miles (16,000 km) or 12 months
- Air Filter Replacement: Every 30,000 miles (48,000 km)
- Fuel Filter Replacement: Every 60,000 miles (96,000 km)
- Spark Plug Replacement: Every 60,000 miles (96,000 km)
- Coolant Flush: Every 4 years or 60,000 miles (96,000 km)
Additional Considerations
- Inspect belts and hoses during regular service intervals.
- Check for any oil leaks or unusual noises.
- Monitor engine performance and fuel efficiency regularly.
Conclusion
The BMW N55 engine is a well-engineered powerplant that combines performance with efficiency. Understanding its specifications, configuration, oil requirements, and maintenance intervals is essential for any owner or enthusiast. By adhering to the recommended service intervals and using the appropriate engine oil, drivers can ensure that their N55 engine remains in optimal condition for years to come.
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