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The BMW S63 engine is a high-performance V8 powerplant developed by BMW’s M Division and is considered one of the most potent engines in BMW’s lineup. Powering cars such as the F10 M5, F90 M5, X5 M, and X6 M, the S63 is renowned for its exhilarating performance, sophisticated engineering, and tuning potential. However, like any high-output engine, the S63 comes with its share of potential reliability concerns and maintenance needs that prospective owners should be aware of.
This article dives into the origins, technical details, and power output of the BMW S63 engine, while also addressing some of the common problems, preventative maintenance tips, and the overall ownership experience, making it a comprehensive buyer’s guide for anyone considering a BMW M car powered by this beastly V8.
The BMW S63 is a 4.4-liter twin-turbocharged V8 that was introduced in 2009, making its debut in the BMW X5 M and X6 M (E70/E71). Derived from the N63 engine, the S63 was developed specifically for BMW’s M Division and features significant upgrades for enhanced performance, durability, and drivability. Over the years, BMW has refined the S63 in various iterations, including the S63B44O0 in the F10 M5 and the latest S63B44T4 in the F90 M5 Competition and X5 M/X6 M models.
The S63 engine produces varying power outputs depending on the model and generation. Below is a breakdown of the different versions of the engine and their respective power figures:
The S63 stands out for a few key reasons, notably its blend of raw power and technological advancements:
The S63 utilizes twin turbochargers mounted in a "hot-V" configuration, meaning the turbochargers are placed inside the V-shaped engine block. This design shortens the distance exhaust gases must travel to reach the turbos, reducing lag and improving throttle response.
The engine uses a direct fuel injection system, which improves efficiency and allows for precise control of the air-fuel mixture, enhancing both power delivery and emissions compliance.
A cross-bank exhaust manifold allows the turbochargers to receive a more consistent flow of exhaust gases, which improves the responsiveness of the engine and reduces turbo lag.
Given the high power output, the S63 is equipped with an advanced cooling system that includes multiple radiators and oil coolers. This helps keep temperatures in check during high-performance driving and track use.
Like most turbocharged engines, the S63 is highly tunable. With basic modifications like an ECU tune and upgraded exhaust, many owners can easily surpass 700 hp, making the engine highly attractive to the aftermarket tuning community.
While the S63 is a powerhouse, it’s not without its quirks and reliability concerns, especially when pushed to its limits. Below are some of the more common issues reported by owners, along with some preventative measures.
One of the most well-known issues with the S63 engine is rod bearing wear. High-revving engines like the S63 put significant stress on the rod bearings, which can eventually wear out and fail if not addressed. In worst-case scenarios, rod bearing failure can lead to catastrophic engine damage.
Turbochargers, especially in high-performance engines, are prone to wear over time. The S63’s turbos can experience oil leaks or bearing failures, particularly in early models like the F10 M5.
Another common issue with the S63 is valve stem seal leaks, which can lead to oil consumption and smoking from the exhaust.
Given the high-performance nature of the engine, the S63’s cooling system is critical. Over time, water pumps, thermostats, and other cooling components can fail, leading to overheating.
The HPFP is a known weak point in the S63, particularly in earlier versions like the F10 M5. Failure of the HPFP can cause rough idling, poor acceleration, and even engine stalling.
Given the S63’s high-performance capabilities, proactive maintenance is key to ensuring the engine remains reliable. Here are a few critical steps to keep the S63 running smoothly:
The S63 is an evolution of the N63 engine, but it features several key upgrades to handle the increased performance demands:
While the S63 is a reliable engine for a high-performance powerplant, it does require diligent maintenance and care to keep running smoothly. Early models, like the F10 M5, tend to have more reliability concerns than later versions, such as the F90 M5. Owners who are proactive with maintenance — particularly when it comes to oil changes, cooling system upkeep, and addressing common wear items — will likely have fewer issues over the engine’s lifespan.
The BMW S63 engine is one of the most impressive V8s in the high-performance segment, delivering incredible power and driving dynamics. However, like any high-output engine, it requires proper care and attention to ensure long-term reliability. If you’re considering buying an M car powered by the S63, being aware of the common issues and performing regular preventative maintenance can make a world of difference in your ownership experience.
With proper care, the S63 engine can deliver not only exhilarating performance but also a rewarding and relatively trouble-free ownership experience. Whether you're an enthusiast looking to enjoy track days or a driver who appreciates the thrill of high-powered luxury, the S63 continues to be a standout engine in BMW’s lineup.
