BMW M54B25 2.5L Engine – Complete 141kW (192 HP) Long Block with Add-On Parts

Complete, Well-Maintained M54B25 Engine for Direct Replacement Across Multiple BMW Platforms.

This listing is for a complete, original BMW M54B25 2.5L inline-6 petrol engine, producing 141 kW (192 horsepower). With a documented mileage of 224,000 km (~139,190 miles), this unit is offered with key add-on parts and described as being in very good condition for its mileage. It serves as a comprehensive, direct-fit solution for replacing a worn or failed engine in a wide array of BMW E-chassis vehicles, leveraging the renowned reliability and smooth performance of the M54 engine family.

Product Overview & Core Specifications

• Engine Code: M54B25 (256S5)

• Displacement: 2.5L (2494cc) Inline-6 Petrol

• Power Output: 141 kW / 192 HP

• Technology: Double-VANOS (Variable Valve Timing)

• Mileage: ~224,000 km (~139,190 mi)

• Condition: Used, Complete with Add-On Parts – Reported Very Good

• Management: Bosch ME7 Engine Management

Primary Vehicle Compatibility

This engine is a direct bolt-in replacement for the following models originally equipped with the M54B25 engine:

• BMW E39 525i / 525xi (2001-2003)

• BMW E46 325i / 325Ci / 325xi (2001-2005)

• BMW E60/E61 525i (Early models, 2004-2005)

• BMW E83 X3 2.5i

• BMW E85 Z4 2.5i

• Note: Always verify exact model year and sub-model compatibility using your VIN.

What’s Included – Engine & Add-On Parts

This engine is sold as a more complete package than a bare long block. Typically includes:

• Complete M54B25 Long Block: Engine block, cylinder head with double-VANOS, and all internal components.

• Key Add-On Parts (As Pictured/Listed): May include the intake manifold with DISA valve, throttle body, valve cover, oil filter housing, possibly the engine wiring harness and ECU (DME), and various sensors/brackets.

• Crucial: Confirm the exact list of included “add-on parts” with the seller via photograph and written list.

Condition Assessment & Buyer Advisory

 Verification of Condition and Components is Paramount.

• Reported Condition: Described as “very good” for its mileage, suggesting no known major faults (e.g., no rod knock, severe overheating history). However, at 224k km, expect seals and wear items to need attention.

• Pre-Purchase Due Diligence is a Must:

  1. Request Documentation: Ask for any available service history or compression test data.

  2. Demand Detailed Photos: High-resolution images of the engine from all angles, focusing on the VANOS unit, oil filter housing (common leak point), and the underside.

  3. Verify Add-Ons: Get a written, itemized list of every included component beyond the long block.

• Professional Installation Recommended: Essential to replace common failure points during installation: VANOS seals, oil filter housing gasket, valve cover gasket, and coolant pipes.

Why Choose This Engine?

✔ Direct Fitment: Simplifies replacement for the listed chassis.
✔ Proven Durability: The M54 is known for longevity when properly maintained.
✔ Complete Package: Inclusion of add-on parts can reduce sourcing time and cost.