BMW X5 F15 X6 F16 M50dX Complete Engine N57X N57D30C 381HP New Timing WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The warranty covers the engine itself; engine accessories are covered by a 30-day warranty.

The power unit was tested before removal and is in full working order.

Listing details

The offer applies to a complete engine.

The engine comes from a right-hand drive (RHD) vehicle. The wiring harness is not compatible with left-hand drive (LHD) vehicles and requires replacement or modification.

BMW X5 F15 X6 F16 M50dX Complete Engine N57X N57D30C 381HP New Timing WARRANTY is an advanced diesel unit from the N57 family, designed for the top-tier M50dX versions. It offers high operating refinement, characteristic of BMW's inline-six diesel engines, and dynamic performance suitable for heavy, high-performance premium SUVs. The complete nature of the engine with a new timing chain provides a solid foundation for professional repair or powertrain upgrades.

Specifications and technical data

• SKU: 2355858-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 2355858
• Substitutable numbers: 2355858, 11002355858, 2355859, 11002355859
• Fuel type: Diesel
• Number of cylinders: 6
• Category: Engines
• Engine code: N57D30C
• Mileage: 49 000

Purpose and characteristics of the N57D30C unit

The offered engine belongs to the Engines category and is dedicated to BMW X5 F15 and X6 F16 models in the M50dX version. The inline cylinder layout and diesel construction ensure a favorable combination of power and efficiency, which is particularly important in vehicles with a massive, sport-utility character. The N57D30C code identifies a modern unit from the N57 family, valued for its flexibility and stable operation across a wide RPM range.

Key technical advantages

The N57D30C engine is a solution aimed at users expecting a significant torque reserve and smooth acceleration throughout the entire speed range. The inline, six-cylinder architecture promotes even power delivery, and the new timing chain reduces the risk of typical failures associated with worn-out valve train components. As a result, the unit is an attractive choice both for comprehensive powertrain rebuilding and for replacing a damaged engine with a proven equivalent.

Condition, mileage, and service application

The engine is offered as used, with documented mileage, which allows for a realistic assessment of its operational potential. This solution is particularly beneficial for workshops specializing in the BMW brand and for informed users who are looking for a factory power unit instead of uncertain replacements. The complete nature of the engine facilitates installation and reduces vehicle downtime in the workshop, which translates into a more predictable cost of the entire operation.

Application in workshop practice

Replacing the power unit in a BMW X5 F15 or X6 F16 M50dX with a complete N57D30C engine allows for restoring full powertrain efficiency in situations where repairing the existing engine is economically unjustified. The new timing chain in the offered unit limits the need for additional intervention in one of the most critical areas of the engine, which is important from the perspective of long-term reliability. This solution is especially recommended in cases of serious mechanical damage, overheating, or extensive bottom-end engine failures.

BMW engines – choosing the right unit and service knowledge

When planning an engine replacement in a BMW, it is worth considering experiences with other models of this brand, including the popular 3 series. For users interested in analyzing typical BMW engine problems, a practical guide has been prepared – more information can be found in the article Troublesome BMW E90 engines – a practical guide to problematic units, which helps to better understand the specifics of the design and the approach to service.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as blocks, cylinder heads, or complete long blocks, check out the available parts in the BMW Engines category.