BMW M54 2.5 Engine Specifications
The BMW M54 engine series is renowned for its performance and reliability, with the M54B25 variant being a popular choice among enthusiasts. This inline-six engine is known for its smooth operation and robust design, making it a staple in various BMW models from the early 2000s.
Engine Specifications Overview
The following table summarizes the key specifications of the BMW M54B25 engine:
| Specification | Details |
|---|---|
| Engine Type | Inline-6, Naturally Aspirated |
| Displacement | 2.5 liters (2494 cc) |
| Power Output | 184 hp (137 kW) at 6000 rpm |
| Torque | 245 Nm (181 lb-ft) at 3500 rpm |
| Compression Ratio | 10.5:1 |
| Fuel System | Electronic Fuel Injection |
| Valvetrain | DOHC, 24 Valves |
| Bore x Stroke | 84 mm x 75 mm |
| Weight | Approx. 160 kg (352 lbs) |
Engine Configuration
The M54B25 engine features a well-engineered configuration that contributes to its performance characteristics.
Key Features of the Engine Configuration
- Inline-6 Design: The inline-six configuration provides a smooth power delivery and balance, reducing vibrations and enhancing driving comfort.
- Aluminum Block and Head: The use of aluminum in both the block and cylinder head reduces weight while maintaining structural integrity.
- DOHC with VarioCam: The dual overhead camshaft (DOHC) design allows for precise control over valve timing, improving efficiency and performance.
- Electronic Throttle Control: This feature enhances throttle response and allows for better integration with the engine management system.
Engine Oil Specifications
Proper engine oil is crucial for the longevity and performance of the M54B25 engine. The following details outline the recommended oil specifications.
Recommended Engine Oil
- Oil Type: Synthetic or Semi-Synthetic
- Viscosity: 5W-30 or 0W-40
- API Rating: API SN or higher
Oil Capacity
The M54B25 engine has an oil capacity of approximately 6.5 liters (including the oil filter).
Service Intervals
Regular maintenance is essential for the M54B25 engine to ensure optimal performance and reliability.
Oil Change Intervals
The recommended oil change intervals for the M54B25 engine are as follows:
- Every 7,500 miles (12,000 km) or 12 months: This interval is suitable for normal driving conditions.
- Every 5,000 miles (8,000 km) or 6 months: Recommended for severe driving conditions, such as frequent short trips, heavy traffic, or extreme temperatures.
Other Maintenance Intervals
In addition to oil changes, other maintenance tasks should be performed at regular intervals:
- Air Filter Replacement: Every 15,000 miles (24,000 km)
- Fuel Filter Replacement: Every 30,000 miles (48,000 km)
- Spark Plug Replacement: Every 60,000 miles (96,000 km)
- Coolant Replacement: Every 2 years or 30,000 miles (48,000 km)
Conclusion
The BMW M54B25 engine is a well-designed powerplant that combines performance with reliability. Understanding its specifications, configuration, oil requirements, and service intervals is essential for any owner or enthusiast. Regular maintenance will ensure that this engine continues to deliver a smooth and enjoyable driving experience for years to come.
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