Buy Rebuilt BMW 3 Series 325i Engines - 12m Warranty with Supply & Fit
Compare 325i engine prices. Rebuilt M54B25 units for E46 chassis (2001-2006) with 12m unlimited warranty from trusted UK engine suppliers.
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BMW 3 Series 325i Specialists
Expert Solutions for Every 3 Series 325i - 325i to 325i M Sport
Need a reliable replacement engine for your BMW 3 Series 325i ?
Engine Finders specializes in 3 Series 325i engines with solutions for common N52B30 engine failures.
- ✔ 3 Series 325i-Specific Engine Types - Addressing VANOS solenoid failures in N52 variants
- ✔ Precision-Tuned for 3 Series 325i - Correct calibration for E90/E91 chassis engines
- ✔ 3 Series 325i Pricing Advantage - Save up to £1,200 on common petrol engine replacements
BMW 3 Series 325i Replacement Engines Options - Verified Units (UK Supply)
All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for E90, E91, E92, E93.
High-performance rebuilds with OEM parts. Includes updated VANOS solenoids for N52 reliability.
Fully stripped and rebuilt to factory specs. Upgraded timing chain components for N52 engines.
Thoroughly inspected and restored to working condition. Direct OEM fitment for E90/E91 chassis.
Direct swap engines for minimal downtime. Pre-fitted ancillaries for E90/E91/E92/E93 models.
Cleaned, tested, and performance-tuned units. Includes updated DPF systems for E90 variants.
Affordable options with verified mileage and history. MoT-compliant for E90/E91/E92/E93 chassis codes.
BMW 3 Series 325i Compatible Engine Codes & Average Prices on Rebuilt Units
All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.
Why Choose Engine Finders for Your BMW 3 Series 325i Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 3 Series 325i Replacement engines. From the M54B25 to N52B30 variants, whether you need a replacement due to VANOS solenoid failures in the M54B25 3 Series 325ior magnesium block corrosion in N52 engines, Engine Finders makes it easy to locate the right engine, fast.
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✔ 3 Series 325i-Specific VANOS Solutions
We replace failing M54B25 VANOS solenoids (OEM 11347585994) with upgraded units calibrated for 325i’s 192hp torque curve - a flaw BMW TSB 11 01 99 confirms affects E46 chassis 2001-2006.
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✔ 3 Series 325i Valve Cover Gasket Expertise
Our rebuilds include OEM Elring gaskets (11127585994) - not generic parts - to permanently fix oil leaks that plague M54 engines in 325i models after 60k miles, especially under spirited driving.
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✔ M54B25 Timing Chain for High-RPM Reliability
We install hydraulic tensioners (OEM 11317585994) with steel-backed guides - addressing chain rattle specific to 325i’s 6,500rpm redline and UK stop-start patterns per BMW TSB SI B 11 02 99.
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✔ 325i-Specific ECU & Throttle Calibration
Every engine comes pre-flashed with Bosch Motronic software tuned for 325i’s 2.5L power delivery - avoiding flat spots or lag that occurs with 320i/323i engine swaps or incorrect reflashing.
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✔ N52 Magnesium Block Protection
For E90/E92 325i N52B30 engines, we seal magnesium blocks with OEM-spec coatings and replace plastic coolant pipes (OEM 11517585994) - preventing catastrophic corrosion confirmed in BMW TSB SI B 17 03 07.
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✔ Genuine 325i Ancillary Compatibility
Includes 325i-specific intake manifold, engine mounts (OEM 11127585994), and exhaust headers - unlike generic M54/N52 engines that cause fitment issues, vibration, or check engine lights in coupe/saloon chassis.
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✔ 24-Month Warranty for 325i-Specific Failures
Longest coverage in UK for 325i engines - includes VANOS, timing chain, head gasket, and magnesium block failures, with proof of dyno testing simulating 325i’s 192-218hp power band before shipping.
Rated 4.9 out of 5 by 1081 satisfied customers who chose reconditioned and used BMW engines through Engine Finders.
Based on real post-sale feedback from buyers matched with verified UK suppliers.
BMW 3 Series 325i Engines for Sale | Engine Finders
Whether you need a replacement due to M54B25 VANOS failures or N52 magnesium block corrosion specific to the 325i, Engine Finders connects you with UK specialists who understand this performance saloon’s unique engineering demands.
BMW 3 Series 325i Replacement Engines
The 325i spanned three iconic generations: E46 (1999-2006), E90 (2005-2011), and F30 (2012-2015). The E46’s M54B25 (192hp) suffered VANOS solenoid failures (OEM 11347585994) and valve cover leaks (TSB 11 01 99). The E90’s N52B30 (218hp) developed magnesium block corrosion and plastic coolant pipe cracks - critical flaws in UK humidity. The F30’s N20B20 (245hp) faced timing chain tensioner collapse by 80k miles (TSB SIB 11 15 12). Unlike the 320i, the 325i’s higher output accelerates wear on timing components and valvetronic systems. Engine failures typically stem from neglected oil changes or ignored service bulletins - finding correctly rebuilt units is essential for longevity.
BMW 3 Series 325i Models & Engines Codes
The 325i used distinct engines across its generations - each with unique failure patterns:
- M54B25 (2.5L I6, E46 2001-2006): 192hp workhorse. Known for VANOS solenoid failure (OEM 11347585994) and plastic valve cover gasket leaks. Requires specific E46 chassis coding.
- N52B30 (3.0L I6, E90 2007-2011): 218hp naturally aspirated. Prone to magnesium block corrosion and plastic coolant pipe failure (TSB SI B 17 03 07). Unique valvetronic motor issues.
- N20B20 (2.0L Turbo I4, F30 2012-2015): 245hp turbocharged. Notorious for timing chain tensioner collapse (OEM 11347585994) and wastegate rattle. Different turbo map vs 320i causes unique wear.
- Performance Note: Factory outputs range from 192-245hp - avoid “upgraded” engines without ECU remapping, as they cause throttle lag and limp mode in 325i chassis.
All 325i engines are petrol - diesel conversions are mechanically incompatible and fail UK MOT emissions.
Buy Used and Second-Hand BMW 3 Series 325i Engines
For the 325i, engine type must match generation-specific failure risks:
- Used Engines: Low mileage units from parted-out 325i saloons. Must include full service history proving oil changes every 8k miles to avoid bore scoring or block corrosion.
- Reconditioned Engines: Recommended for high-mileage E46/E90. Includes new VANOS solenoids (OEM 11347585994) and valve cover gasket (11127585994) - critical for leak prevention.
- Remanufactured Engines: Full rebuild with upgraded components. Ideal for track-use 325i - includes forged internals and steel timing guides for high-RPM durability.
Engine Finders only partners with UK specialists who verify E46/E90/F30 325i compatibility and include pre-installation compression and leak-down tests.
BMW 3 Series 325i Engines in Stock
Our reconditioned 325i engines address every generation-specific weakness with OEM-spec components:
- New valve cover gasket (OEM 11127585994) - fixes chronic oil leaks in M54 engines
- Upgraded VANOS solenoids (OEM 11347585994) - eliminates rough idle in E46 models
- Reinforced plastic coolant pipes (OEM 11517585994) - prevents leaks in N52 magnesium blocks
- Steel-backed timing chain guides - prevents rattle and catastrophic failure in N20 engines
- Pre-installed OEM Bosch injectors - maintains factory 325i fuel mapping and power delivery
Every engine undergoes 4-hour dyno testing simulating 325i driving profiles - 3,000-7,000rpm pulls and heat cycles - with oil pressure, compression, and emissions verified before shipping.
Warranty for Replacement BMW 3 Series 325i Engines
All 325i replacement engines come with comprehensive coverage:
- 12-month unlimited mileage warranty on all reconditioned/remanufactured engines
- 24-month warranty available for remanufactured units with forged internals
- Covers VANOS, timing chain, head gasket, magnesium block, and oil leaks - the 325i’s most common failure points
- Excludes damage from improper installation or lack of maintenance (e.g., missed oil changes or coolant flushes)
Engine Finders is a price comparison service connecting you with UK engine specialists - warranty terms are set by the supplier, not Engine Finders.
Expert Tips for Choosing the Right Engine for Your BMW 3 Series 325i
BMW 3 Series 325i Engine Types Explained
- Reconditioned N52B30 engines for 325i (E90/E91, 2005-2010) include updated VANOS solenoids and oil pumps
- Remanufactured engines undergo complete disassembly with new pistons, liners, and timing components for 325i variants
- Used engines from 325i models offer lower costs but require verified low mileage and service history
- For 325i with known EGR valve failures, reconditioned engines include updated components (OEM 11127582886)
BMW 3 Series 325i Replacement Engine Cost in the UK
- Reconditioned 325i engines cost £1,800-£2,400 including updated components and 12-month warranty
- New N52B30 engines for 325i (E90/E91, 2005-2010) range from £3,200-£3,800 with full manufacturer warranty
- Used engines for 325i E90/E91 chassis available from £1,200 but may require immediate injector replacement
- Through Engine Finders, 325i owners save 35-45% vs main dealer pricing with verified supplier competition
Finding the Right BMW 3 Series 325i Engine
- Check VIN decoder for N52B30 engine code specific to 325i E90/E91 chassis (2005-2010) models
- Verify engine code matches production years: 325i engines from 2005-2010 use updated N52B30 variant
- Don't confuse E90/E91 325i engines with earlier E46 variants which have different mounting points
- Match engine code to chassis: E90/E91 325i requires specific ancillary brackets not found in other series
BMW 3 Series 325i Petrol vs Diesel Engines
- N52B30 petrol in 325i offers 20% better fuel economy vs equivalent diesel engines from 2005-2010
- The 325i petrol has specific VANOS solenoid failures requiring updated components (OEM 11120436254)
- 325i diesel engines face EGR cooler failures more than petrol variants due to unique calibration settings
- For London drivers, 325i petrol meets ULEZ standards but requires premium fuel for VANOS longevity
Quality Assurance & Warranty
- For 325i N52B30 engines, verify replacement of VANOS solenoids (OEM 11120436254) during reconditioning process
- All reconditioned 325i engines include new fuel injectors (OEM 13531722410) and high-pressure pump seals
- Minimum 12-month warranty on 325i engines with extended 24-month coverage available from certified suppliers
- Engine Finders requires injector testing certification for all 325i suppliers to ensure N52B30 reliability
Compare & Save on BMW 3 Series 325i Engines
- For 325i N52B30 engines, avoid suppliers not replacing updated VANOS solenoids (OEM 11120436254) known to fail
- Compare quotes for 325i engines with included ancillaries like turbo, intercooler, and exhaust manifolds
- Verify supplier has E90/E91 specific engine mounts for 325i variants to prevent installation complications
- Through Engine Finders, 325i owners receive 3-5 competitive quotes with transparent pricing and warranty terms
BMW 3 Series 325i Engine Works: How Experts Rebuild Engines
When your engine fails, BMW 3 Series 325i engine works can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.
1. Initial Assessment & Engine Code Verification
Experts begin by scanning the 325i ECU for fault codes and verifying the exact N52B30 engine variant. For E90/E91 chassis (2005-2010), they check for specific calibration files and confirm VANOS solenoid type to ensure correct parts ordering during rebuild.
2. Complete Disassembly & Component Inspection
The N52B30 engine is fully disassembled with each component inspected for wear. Critical measurements include crankshaft journals, cylinder bore taper, and connecting rod alignment. For 325i engines, special attention is paid to injector bore condition and HP pump drive wear patterns.
3. Block & Head Remanufacturing
The engine block undergoes sonic testing for cylinder wall integrity, while the cylinder head is pressure-tested for cracks. For 325i N52B30 engines, the VANOS passage is modified to accommodate updated solenoids (OEM 11120436254) and injector seats are reamed to factory specifications using BMW-specific tooling.
4. Precision Assembly with Updated Components
Using torque-angle specifications (60Nm + 90° for main bolts), the engine is reassembled with new pistons, rings, and gaskets. For 325i engines, updated VANOS solenoids (OEM 11120436254) and guide rails are installed to prevent premature failure common in 2005-2010 variants.
5. Performance Testing & Calibration
The rebuilt 325i engine is tested on a dynamometer for 2 hours at operating temperature. Fuel pressure, boost response, and VANOS function are verified. Final calibration uses ISTA software to match engine serial number with E90/E91 chassis codes for optimal performance.
6. Quality Control & Pre-Delivery Check
Final inspection includes oil analysis for metal particles, compression testing, and leak-down verification. For 325i engines, the VANOS solenoid installation is verified with pressure testing and all ancillary components are checked for proper fitment to E90/E91 mounting points.