The BMW E39 M5 remains one of the most coveted performance sedans ever produced, largely due to its naturally aspirated S60B V8 engine. This remarkable powertrain delivered a thrilling driving experience that balanced brute force with remarkable refinement, setting a benchmark for sports sedans in the late 1990s and early 2000s. Understanding the engineering within this specific model is essential for enthusiasts, potential buyers, and anyone interested in BMW’s storied M division history.
The S60B Engine: A Naturally Aspirated Masterpiece
At the heart of the E39 M5 lies the S60B40, a hand-assembled aluminum V8 that replaced the previous M60 engine. Displacing 4.0 liters, this engine was purpose-built for high-rev performance, redlining at an astonishing 7,900 RPM and producing 394 horsepower and 266 lb-ft of torque in its standard form. Unlike modern turbocharged counterparts, the S60B derives its power from its high state of tune, large valves, and a free-revving nature that rewards drivers who enjoy winding the tach.
Technical Specifications and Engineering
The S60B’s design incorporates a cast aluminum block and head, reducing weight while maintaining strength. The engine features variable valve timing (VANOS) on the intake camshaft, which optimizes torque delivery across the rev range and improves efficiency. It uses two throttle bodies and a six-speed manual transmission as standard, with a four-speed automatic option available, sending power to the rear wheels in a classic and dynamic layout.
| Specification | Detail |
|---|---|
| Engine Code | S60B40 |
| Configuration | 90-degree V8 |
| Displacement | 3,999cc (4.0L) |
| Horsepower | 394 hp @ 7,900 RPM |
| Torque | 266 lb-ft @ 3,800 RPM |
| Valvetrain | DOHC, 4 valves per cylinder with VANOS |
The Driving Experience and Performance
Behind the wheel, the E39 M5 offers a near-perfect blend of accessibility and excitement. The initial power delivery is smooth, but as the revs climb, the engine comes alive with a ferocious eagerness to rev. The manual gearbox is a precise instrument, allowing drivers to harness the full potential of the S60B. Acceleration is sharp, and the chassis provides a level of composure that makes this sedan feel significantly more agile than its size suggests.
Handling and Chassis Dynamics
Power is only one part of the equation; the E39 M5’s chassis is equally impressive. It features a sophisticated double-wishbone suspension at both ends, coupled with adaptive damping (EDC) and an anti-roll bar system that adjusts based on driving dynamics. This setup allows the car to carve through corners with confidence while maintaining a comfortable ride quality on everyday roads, demonstrating BMW’s commitment to the "Ultimate Driving Machine" philosophy.
Reliability, Maintenance, and Ownership
Owning an E39 M5 requires a commitment to regular maintenance, but it is generally regarded as a reliable machine when properly cared for. Key service items include the timing belt, which should be replaced at the recommended intervals, along with attention to the VANOS solenoids and oil cooler. Sourcing genuine BMW parts and finding a mechanic experienced with M cars is crucial for long-term ownership satisfaction.
Common Issues and Considerations
- Coolant Leaks: The upper intake manifold gaskets are a known vulnerability and should be inspected periodically.
- VANOS System: Malfunctioning variable valve timing solenoids can cause rough idling or power loss, requiring professional diagnosis.
- Electrical Gremlins: As with many electronics-rich cars of that era, occasional sensor or wiring harness issues may arise.
Legacy and Market Appeal
The E39 M5 cemented its status as an icon, bridging the gap between traditional grand tourers and modern super sedans. Its combination of performance, comfort, and usability ensured its popularity, and it remains a highly sought-after model in the used car market. Values have steadily appreciated, making it a sound investment for collectors who appreciate engineering excellence and the emotional connection of driving a true BMW.
Conclusion and Final Thoughts
The BMW E39 M5 is more than just a fast car; it is a testament to the golden era of analog performance and driver-focused engineering. The S60B engine is the beating heart of this masterpiece, offering a symphony of sound and power that continues to captivate drivers. For those seeking a used high-performance sedan that delivers excitement without sacrificing daily practicality, the E39 M5 remains a top-tier choice in the automotive landscape.
