BMW E46 M3 S54 Engine Complete S54B32 326S4 343HP 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 E46 M3 S54 Engine Complete S54B32 326S4 343HP WARRANTY is a highly regarded, inline M-series powertrain designed for demanding users looking for a powerful, high-revving petrol unit. This complete six-cylinder engine is a solid foundation for professional repairs, swaps, or rebuilding the sports drivetrain in the BMW 3 Series E46 generation.

Specifications and technical data

• SKU: 0304348-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0304348
• Substitutable numbers: 11000304348, 0304348, 11000154617, 0154617, 11007831913, 7831913, 11000304349, 0304349, 11007831914, 7831914, 11000154618, 0154618
• Fuel type: Petrol
• Number of cylinders: 6
• Category: Engines
• Mileage: 59 000

Technical characteristics of the S54 unit

The presented engine belongs to the Engines category and represents a sports design from the BMW M Power family. The inline six-cylinder layout combined with petrol fuel supply ensures dynamic performance, high refinement, and quick revving, which is particularly valued in track applications and dynamic road driving.

The S54B32 unit is known for its precise throttle response, stable operation across a wide rev range, and great potential for further mechanical and electronic modifications. Thanks to this, the engine performs excellently both in stock configurations and in projects focused on motorsport.

Application, compatibility, and identification

The engine was developed for the BMW E46 M3 model, where it serves as the main component of the drivetrain. Thanks to OEM markings and available replacement numbers, it is possible to precisely verify compatibility with a specific body version and vehicle year, which minimizes the risk of an incorrect purchase.

To facilitate identification in catalog systems and when contacting store support, you can use designations such as SKU (stock code), OEM part number, and available Replacement numbers, which are presented in the technical specification section and linked to this specific unit.

Condition, mileage, and operational potential

The unit is offered as a used petrol engine, which allows for a significant reduction in repair or upgrade costs compared to purchasing a brand-new powertrain. The declared mileage is important information when planning further operation, service, and potential regeneration of selected components.

In practice, this means that the engine can be used both as a direct replacement for a damaged unit and as a base for tuning projects, where deeper mechanical intervention is already planned (e.g., forced induction reinforcement, camshaft changes, fuel system or exhaust modifications).

Benefits of choosing an original BMW engine

By choosing a complete S54 engine designed for the BMW E46 M3, you gain primarily factory structural fitment for the engine bay, cooling system, accessories, and vehicle electronics. This limits the need for mounting modifications and facilitates workshop work, reducing vehicle downtime.

An additional advantage is maintaining the handling character typical of the M3 E46 – linear power delivery, high flexibility, and the sporty sound of the inline-six. For many users, this is a key argument for sticking to the original drivetrain concept instead of using units from other models.

Professional selection and technical support

To minimize the risk of error when purchasing a used engine, it is worth using selection procedures based on the VIN number and OEM markings. We describe these issues in detail in our guide Why it is worth buying used gearboxes and engines – facts instead of myths, where you will find practical tips on how to consciously assess the profitability of a purchase and verify part compatibility with your car.

If you want to prepare even better for your purchase and learn methods to avoid incorrect orders, the article how to professionally select used car parts using OEM numbers, where we discuss the compatibility verification process step by step, will also be helpful.

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 out the available parts in the BMW Engines category.