High-performance BMW N52B25 / N52B25A 2.5L Inline-6 Bare Engine Long Block. Original factory cylinder block and cylinder head, forged crankshaft, pistons, and Valvetronic timing system (external accessories excluded). Upgraded with revised valve stem seals and piston rings to completely eliminate native oil burning and hydraulic valve lifter ticking noises. Directly replaces OE part numbers 11000415250, 11000431065, and 11002158863. Fits BMW 325i, 525i, X3 2.5i, and Z4 (E90, E60, E83, E85). Backed by 100% 17-digit VIN check, pre-shipment live compression test video, and a 12-month warranty.
100% Fitment Guaranteed: Checked via VIN before shipping.
12-Month Warranty: Full quality assurance.
Strict QC Passed: Compression test & endoscope inspection video provided.
Global Express & Sea Freight: Door-to-door delivery with customs clearance support.
Technical Specifications：
| Attribute Name | Attribute Values |
| OE NO. / OEM NO. | 11000415250, 11000431065, 11000415248, 11002158863, 11000431067 |
| Interchange OE Number | 11 00 0 415 250, 11 00 0 431 065, 11000415251, 11127521183, 11127558661 |
| Engine Code | N52B25, N52B25A, N52B25AF, N52B25B F, N52 |
| Car Fitment / Model | BMW 325i, BMW 525i, BMW 323i, BMW 523i, BMW X3 2.5i, BMW Z4 2.5i |
| Chassis Code | E90, E91, E92, E93, E60, E61, E83, E85, E89, E84 |
| Displacement | 2.5L / 2497 cc / 2.5 Liter |
| Engine Type | Naturally Aspirated Gasoline / Multi-Point Injection (MPI) |
| Valvetrain System | DOHC 24V with Double-VANOS & Valvetronic |
| Assembly Type | Bare Engine / Long Block / Short Block / Engine Block Assembly |
| Engine Condition | Remanufactured / Rebuilt / OEM Tested Bare Engine |
| Technical Upgrades | Upgraded Anti-Oil Burning Valve Seals & Piston Rings / Tappet Noise Fixed |
| Components Included | Magnesium-Aluminum Block, Cylinder Head, Crankshaft, Pistons, Rods, Valvetronic |
| Components Excluded | Intake/Exhaust Manifolds, Alternator, Starter, Water Pump, Coils, Harness |
| QC Inspection | 100% Cylinder Compression Passed / Bore Scope Inspected / Video Provided |
| Warranty | 12 Months |
Vehicle Compatibility
BMW 3 Series: 323i, 325i, 325xi (E90 / E91 / E92 / E93) [2005–2011]
BMW 5 Series: 523i, 525i, 525xi (E60 / E61) [2005–2010]
BMW X3: X3 2.5i / xDrive25i (E83) [2006–2010]
BMW Z4: Z4 2.5i / 2.5si / sDrive23i (E85 / E86 / E89) [2005–2011]
BMW X1: X1 xDrive25i (E84) [2009–2011]
| Brand | Series/Model | Official Chassis Code | Production Years |
| For BMW | 325i / 325xi / 323i | E90 / E91 / E92 / E93 | 2005–2011 |
| 525i / 525xi / 523i | E60 / E61 | 2005–2010 | |
| X3 2.5i / xDrive25i | E83 | 2006–2010 | |
| Z4 2.5i / 2.5si / sDrive23i | E85 / E86 / E89 | 2005–2011 | |
| X1 xDrive25i | E84 | 2009–2011 |
Product Details:
Quality Assurance & Testing Procedure：
Cylinder Inspection: Endoscope check to ensure zero scratches inside the cylinders.
Pressure Test: Cylinder pressure and oil pressure tested within factory standards.
Crankshaft & Timing Check: Replaced with fresh oil seals and verified timing chain kit.
Pre-Shipment Video: We send a live test video of your specific engine unit before crating.
Packaging & Logistics：
Protective Packaging: Sealed in anti-rust vapor barrier bag, placed inside a heavy-duty ISPM-15 certified export wooden crate.
Lead Time: 5–10 working days for processing and testing.
Shipping Methods: Air Freight (DDP/DAP) for urgent orders; Sea Freight for bulk/B2B orders.
FAQ Section：
Q: How do I make sure this engine fits my vehicle?
A: Please send us your 17-digit Vehicle Identification Number (VIN) or frame number via live chat or order notes. Our technical team will verify compatibility within 10 minutes.
Q: Is this a complete long block or short block?
A: We offer both options. The standard listing is for a complete engine assembly (Long Block with cylinder head, oil pan, and timing system). External accessories like turbochargers, alternators, and starter motors can be included upon request.
Q: What is the warranty policy?
A: We provide a 12-month limited warranty covering core internal components (crankshaft, pistons, camshafts, block). Warranty claims require proof of installation by a certified mechanic.
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