BMW 5 Series E60 E61 525i Complete Engine M54 M54B25 256S5 192HP 84k m 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 5 Series E60 E61 525i Complete Engine M54 M54B25 256S5 192HP 84k m WARRANTY is a complete, inline powertrain from the M54 family, designed for the 5 Series E60 and E61 models. This petrol unit with a six-cylinder design provides the characteristic BMW refinement and smooth power delivery, and the low declared mileage makes it an attractive base for an engine swap or a major powertrain repair.

Specifications and technical data

• SKU: 0304304-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 304304
• Substitutable numbers: 11000304304, 0304304, 11000304305, 0304305
• Fuel type: Petrol
• Number of cylinders: 6
• Category: Engines
• Mileage: 59 000

Technical characteristics of the M54B25 engine

The presented engine belongs to the Engines category and represents the classic BMW inline six-cylinder design. This layout ensures excellent mechanical balance, reduced vibrations, and predictable throttle response, which translates into driving comfort and precise power delivery. The unit runs on petrol, which facilitates the maintenance of stable operating parameters and compatibility with the factory control electronics in the BMW 5 Series E60/E61 525i.

The M54B25 engine is valued in the service industry for its refined design, good availability of consumables, and predictable installation procedures. The inline cylinder layout simplifies maintenance, and the clear arrangement of accessories allows for efficient transfer of the unit between chassis within the same generation.

Application and compatibility in the BMW E60/E61 525i

The offered powertrain has been prepared for use in BMW 5 Series E60 and E61 models in the 525i version with the M54 engine. By maintaining the original mounting architecture, it is a solution particularly useful for:

• replacing a damaged engine with a complete unit of known origin,
• rebuilding a car after a mechanical failure in the crankshaft or cylinder head area,
• restoration projects where maintaining compliance with the factory BMW specification is a priority.

The six-cylinder petrol unit works well with both factory manual and automatic transmissions intended for the 525i version, which facilitates integration with the vehicle's existing powertrain.

Condition, mileage, and benefits of choosing a used engine

The engine is in used condition, which in practice means that it has already been in operation in a vehicle but retains parameters allowing for further operation after proper installation and basic initial service. The declared mileage is relatively low for this generation of units, which increases the potential for further operation with proper maintenance.

Choosing a used BMW petrol engine is often a cost-effective solution compared to a full rebuild of a damaged unit. It allows for reducing vehicle downtime while maintaining the original operating characteristics typical of the M54B25. For many workshops and users, this is a reasonable compromise between cost and durability.

To better understand the differences between buying a used engine and repairing the current unit, it is worth reading our expert guide: Why it is worth buying used gearboxes and engines – facts instead of myths, which discusses, among other things, selection by OEM numbers and cost ratios.

Practical installation and operating tips

When installing the complete M54B25 engine in a BMW E60/E61 525i, it is recommended to perform a standard package of preparatory activities, such as replacing consumables, checking the cooling system for leaks, and verifying the associated accessories. This minimizes the risk of unplanned downtime after installation and ensures stable operating conditions from the very first kilometers.

Due to the six-cylinder design and the petrol nature of the unit, it is particularly important to use the appropriate quality of engine oil and regularly check the ignition system. A properly serviced M54 engine is capable of covering significant mileage while maintaining refinement and predictable performance.

Powertrain expansion and 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.