2015-2018 BMW X5 M (F85) 4.4 V8 (575 Hp) xDrive Steptronic

The BMW X5 M (F85), produced from March 2015 to April 2018, represents the high-performance variant of the second-generation BMW X5 (F15). Positioned as the flagship SUV within BMW’s M division, the F85 aimed to deliver uncompromising performance and luxury in a practical, family-oriented package. It’s built on the X5 platform (F15) but significantly enhanced with M-specific components for a more aggressive driving experience. This particular configuration, featuring the 4.4-liter V8 engine producing 575 horsepower paired with the xDrive all-wheel-drive system and Steptronic 8-speed automatic transmission, was the sole powertrain option for the F85 generation.

Technical Specifications

INTRODUCTION

The BMW X5 M (F85) arrived as a response to growing demand for high-performance luxury SUVs. Building upon the already capable X5, the M variant significantly upped the ante with a potent engine, upgraded suspension, and aggressive styling cues. The F85 was produced exclusively with the S63B44 engine and xDrive all-wheel-drive system, making it a focused performance machine. It filled a niche for buyers wanting the practicality of an SUV combined with the driving dynamics of a sports car. The F85 generation was relatively short-lived, replaced by the F95 X5 M in 2019.

Powertrain & Engine Architecture

At the heart of the X5 M lies the S63B44 4.4-liter twin-turbocharged V8 engine. This engine, a derivative of the N63 family, was heavily revised by BMW’s M division for increased power and durability. Key upgrades included reinforced crankshafts, connecting rods, and pistons, along with a more robust cooling system. The engine utilizes direct injection and Valvetronic technology for precise control over intake valve timing. Two twin-scroll turbochargers, positioned within the V of the engine, deliver boost pressure to minimize turbo lag. The engine produces 575 horsepower at 6000-6500 rpm and a substantial 750 Nm (553 lb-ft) of torque between 2200 and 5000 rpm. The Steptronic 8-speed automatic transmission, specifically tuned for the M model, features quicker shift times and a more aggressive shift program. The xDrive all-wheel-drive system is rear-biased, typically sending 60% of the power to the rear wheels for a more engaging driving experience, but can dynamically adjust the power distribution based on traction conditions.

Driving Characteristics

The X5 M delivers a surprisingly agile driving experience for a vehicle of its size and weight. The powerful V8 engine provides effortless acceleration, with the 0-60 mph sprint taking around 4 seconds. The Steptronic transmission shifts quickly and smoothly, and the driver can also take control with paddle shifters. The xDrive system provides excellent traction in all weather conditions, inspiring confidence during spirited driving. While not as nimble as a dedicated sports car, the X5 M offers a compelling blend of performance and practicality. The suspension is firm, providing minimal body roll, but can feel somewhat harsh on rough roads. The steering is precise and well-weighted, offering good feedback to the driver. Compared to the standard X5, the M variant offers a significantly more engaging and dynamic driving experience.

Equipment & Trim Levels

The X5 M came standard with a comprehensive list of features, reflecting its premium positioning. Interior appointments included Merino leather upholstery, M sport seats with power adjustment and memory function, and carbon fiber trim. Standard technology included a 10.2-inch iDrive infotainment system with navigation, a premium sound system, and a head-up display. Optional extras included a variety of customization options, such as different interior color schemes, upgraded leather options, and a rear-seat entertainment system. Exterior features included M-specific aerodynamic enhancements, such as a front splitter, side skirts, and a rear diffuser, as well as large alloy wheels and high-performance brakes.

Chassis & Braking

The X5 M features a significantly upgraded chassis compared to the standard X5. The suspension utilizes adaptive dampers and stiffer springs, lowering the ride height for improved handling. The front suspension employs a double-wishbone design, while the rear suspension utilizes an independent multi-link setup. Large, ventilated disc brakes with blue-painted calipers provide ample stopping power. The braking system also includes ABS, dynamic stability control, and traction control. The rear brakes are also ventilated discs, a step up from some lower X5 trims which used solid discs. A thicker stabilizer bar was also fitted to reduce body roll.

Market Reception & Comparison

The X5 M was generally well-received by automotive critics, who praised its powerful engine, engaging handling, and luxurious interior. However, some critics noted the firm ride quality and relatively high fuel consumption. Compared to other high-performance SUVs, such as the Porsche Cayenne Turbo and the Mercedes-Benz ML63 AMG, the X5 M offered a compelling combination of performance, luxury, and practicality. Fuel economy, at around 21.2 US mpg combined, was typical for a vehicle in this class, but significantly lower than the non-M X5 models. Reliability was generally good, although some owners reported issues with the cooling system and turbochargers.

Legacy

The F85 X5 M remains a desirable vehicle in the used car market, appealing to buyers seeking a high-performance luxury SUV. The S63B44 engine is known for its robust construction and potential for tuning, making it a popular choice among enthusiasts. While maintenance costs can be higher than those of a standard X5, the F85 offers a unique driving experience that sets it apart from its more pedestrian siblings. The F85 laid the groundwork for the even more capable F95 X5 M, continuing BMW’s tradition of delivering high-performance SUVs.