BMW E81 E87 E90 118i 318i N43 Complete Engine N43B20AY with 10k miles

BMW E81 E87 E90 118i 318i N43 Complete Engine N43B20AY with 10k miles designed for BMW 1 Series E81/E87 and 3 Series E90 models with 118i and 318i units is a used powertrain with a mileage of approximately 95,000 km, providing a solid foundation for a professional engine replacement. This is a solution for workshops and informed users looking for a complete, original N43 petrol engine that maintains compliance with BMW factory specifications.

Specifications and technical data

• SKU: 0427103-5
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0427103
• Substitutable numbers: 11000427103, 0427103, 11000427104, 0427104, 116i316i122HP, N43B20A, N43, N43B20
• Category: Engines
• Mileage: 59 000

Engine purpose and compatibility

The offered engine comes from the N43 family and is dedicated to petrol versions of the BMW 118i and BMW 318i in E81, E87, and E90 body styles. The design of the N43B20AY unit was developed to combine reasonable performance with operating economy, making it an attractive choice when replacing a worn or damaged engine in these models.

As a complete powertrain, the engine allows for the preservation of the original operating characteristics of the unit, proper fitment to factory accessories, and engine management in a given BMW model. This makes it a practical base for installation in place of the existing engine, while maintaining compatibility with the factory engine bay architecture.

Technical characteristics of the N43B20AY unit

The N43 family consists of modern, four-cylinder BMW petrol engines with an advanced fuel supply system and precise unit operation control. The applied design solutions allow for a favorable compromise between dynamics and fuel consumption, while maintaining the refinement typical of BMW units of this generation.

The offered engine, as a complete assembly, constitutes a coherent package of mechanical components and accessories, which, after appropriate installation preparation, can be adapted to replace the existing unit in the vehicle. A mileage of approximately 95,000 km indicates a moderate degree of wear, which is important when planning long-term use after replacement.

Application in service practice

The N43B20AY engine will prove effective both in professional workshops specializing in the BMW brand and for private users working with a trusted service center. Replacing a complete powertrain is often more predictable in terms of time and cost than an extensive repair of an old engine, especially in cases of severe mechanical damage.

Before installation, standard preparatory activities are recommended, such as checking for leaks, verifying accessories, replacing consumables, and adjusting control elements in accordance with manufacturer procedures. Such an approach increases the chances of trouble-free operation after installation and facilitates subsequent diagnostics.

Selection by OEM and replacement numbers

The engine has an assigned OEM part number and associated interchangeable numbers, which facilitates precise identification of the unit in BMW catalogs and service systems. When selecting for a specific car, it is worth using the vehicle's VIN and part numbers to confirm full compliance with the factory configuration of the given unit.

For users and workshops that want to deepen their knowledge about the cost-effectiveness of installing a used engine and the procedures for selection by VIN and OEM numbers, the following expert guide will be helpful: Why it is worth buying used gearboxes and engines – facts instead of myths. The article explains the differences between theory and service practice and shows how to consciously approach the purchase of a used powertrain.

Condition, mileage, and benefits of buying a used engine

The offered engine belongs to the Engines category and is a used item, which directly translates into a more favorable cost level compared to a new unit. A mileage of approximately 95,000 km is typical for cars of this generation and allows the engine to be treated as a real alternative to repairing a heavily worn unit in the vehicle.

Purchasing a used engine of this class is a solution that can significantly reduce the total cost of repair while maintaining the original BMW specification. Additional tips on the safe purchase of used components online, including seller verification and part selection by numbers, can be found in the guide: Safe purchase of used car parts online – a step-by-step guide.

Expanding the repair project – other BMW Engines

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 powertrains, check the available parts in the BMW Engines category.