BMW X5 F15 X6 F16 M50dX Bare Engine N57X N57D30C 381HP with 49k miles, WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

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

Listing details

The offer applies to a bare engine.

The engine is sold without accessories (e.g. alternator, starter motor, manifolds, injectors, turbocharger, etc.).

BMW X5 F15 X6 F16 M50dX Bare Engine N57X N57D30C 381HP with 49k miles, WARRANTY is a factory-spec, six-cylinder diesel engine block designed for the top-tier M50dX versions. This used, complete block with cylinder head provides a solid foundation for professional repairs or engine swaps, maintaining original performance parameters and torque characteristics. It is the ideal solution for users who expect consistency with the factory BMW design and predictable drivetrain behavior.

Specifications and technical data

• SKU: 2355858
• 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 compatibility

The offered bare engine is dedicated to BMW X5 F15 and BMW X6 F16 models in M50dX versions, which utilize the high-performance diesel engine with the N57D30C code. The unit's construction was developed for dynamic driving, high flexibility, and stable operation under heavy loads typical of premium segment SUVs.

A bare engine means it serves as a base for further assembly with the accessories from your vehicle, which facilitates compatibility with the existing electrical system, intake, exhaust, and cooling systems. This solution is particularly beneficial for post-accident repairs or replacements following a mechanical failure of the engine's lower section.

Construction and characteristics of the N57D30C unit

The engine belongs to the family of modern BMW diesel units, featuring six cylinders in an inline configuration. This setup ensures high refinement, smooth power delivery, and favorable distribution of mechanical loads within the block. The version used in the M50dX is designed for very high power density, which translates into decisive throttle response and efficient acceleration of the heavy body.

The inline cylinder layout also promotes good service accessibility and predictable thermal behavior. In practice, this facilitates installation, leak checks, and subsequent maintenance tasks by the workshop. The N57D30C unit is a popular choice for users who expect a combination of performance and reasonable fuel consumption in daily operation.

Practical application and benefits of installation

Replacing a damaged engine with a bare engine from the same family allows you to maintain the vehicle's factory specification without the need to modify wiring harnesses, ECUs, or the drivetrain. This is particularly important in the case of advanced M50dX versions, where software and mechanical consistency has a direct impact on durability and the proper operation of driver assistance systems.

A used engine is a good choice for workshops specializing in the BMW brand and for informed users who want to restore the original drivetrain configuration after a major failure. By keeping the same engine family, the risk of compatibility issues with the engine control unit, xDrive system, or automatic transmission is minimized.

Used engine – what to pay attention to during installation

Before installation, standard preparatory steps are recommended, such as checking for leaks, verifying the condition of seals, and preparing surfaces for the accessories transferred from the previous unit. In the case of diesel engines, it is also particularly important to properly bleed the fuel system and precisely set the timing in accordance with the manufacturer's procedures.

Professional installation at a specialized BMW service center allows you to fully utilize the potential of this unit and limit the risk of secondary faults. For the workshop, this means predictable labor time and a lower risk of unexpected complications, and for the user – stable, repeatable engine performance after the repair is completed.

BMW engines – expanding knowledge and selecting a unit

If you are interested in a broader context of operation and typical problems of BMW power units, it is worth familiarizing yourself with practical tips regarding other models. An article describing critical designs, available here, may be helpful: Troublesome BMW E90 engines – a practical guide to problematic units. This will allow you to better understand the specifics of this brand's engines and approach the servicing of your own car with awareness.

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