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BMW N52B30 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The BMW N52B30 is BMW's final naturally aspirated 3.0-litre straight-six - fitted to the E90 330i, E60 530i, E63 630i and E83 X3 3.0si from 2004 to 2011. Reconditioned N52B30 units are available from around £3,500, with used examples from £1,500-£2,800 depending on condition and history.
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Key Specs
BMW N52B30 - Specifications at a Glance
Engine Code
N52B30 (N52B30A / N52B30B / N52B30O0)
Fuel
Petrol
Configuration
3.0L inline-6, naturally aspirated, DOHC, 24-valve
Power Output(s)
218-272 hp (160-200 kW); 270-315 Nm torque
Years Produced
2004-2011
UK Models Fitted
6 model families - full list in Compatibility below
2025 UK Replacement Requests
[Not available in proprietary data]
Replaced
M54B30 (predecessor)
Replaced By
N53B30 (Europe) / N20 turbo (later)
Most Common Failure
Valve stem seals / oil consumption
Reconditioned Price Range
£3,500-£5,000 supply-only
Vetted UK specialists for N52B30 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which BMW Models Use the N52B30-
The N52B30 was BMW's workhorse 3.0-litre straight-six throughout the mid-2000s, fitted across the 1 Series, 3 Series, 5 Series, 6 Series, 7 Series, X3 and Z4 ranges. It was the final naturally aspirated straight-six produced by BMW for most markets.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 BMW 1 Series | E81 / E82 / E87 / E88 | 130i | 2005-2011 | |
 BMW 3 Series | E90 / E91 / E92 / E93 | 330i, 325i (US) | 2005-2007 | |
 BMW 5 Series | E60 / E61 | 530i, 525i (US) | 2004-2007 | |
| BMW 6 Series | E63 / E64 | 630i | 2004-2007 | |
| BMW 7 Series | E65 / E66 | 730i | 2005-2008 | |
 BMW X3 | E83 | 3.0si | 2006-2010 | |
| BMW X5 | E70 | 3.0si | 2006-2010 | |
| BMW Z4 | E85 / E86 | 3.0i, 3.0si | 2005-2008 |
02
BMW 3 Series
03
BMW 5 Series
04
BMW 6 Series
05
BMW 7 Series
06
BMW X3
07
BMW X5
08
BMW Z4
CROSS-BRAND
N52B30 is documented across 8 BMW applications spanning BMW 1 Series, BMW 3 Series, BMW 5 Series, BMW 6 Series, BMW 7 Series, BMW X3, BMW X5, BMW Z4. Registration lookup confirms the exact suffix before quotes are sent.
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Not sure which engine your car has- Enter your registration above - we'll confirm your exact N52B30 fitment before any quotes are sent.
Prices
BMW N52B30 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|
The N52B30 is a well-understood engine with strong parts availability. Prices vary based on whether the valve stem seals have been replaced, whether the Valvetronic motor and VANOS solenoids are fresh, and whether the engine is a 218 hp, 258 hp or 272 hp variant. See our full reconditioned engine cost guide for context.
Labour Guide
Fitting an N52B30 typically takes 10-14 hours at £65-£85/hr (independent BMW specialist) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
BMW N52B30 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the N52B30, based on real-world data and verified failure patterns.
Verified issue focus: Valve stem seals / oil consumption.
1. Valve stem seal wear - oil consumption and blue smoke
1. Valve stem seal wear - oil consumption and blue smoke
Typical onset:
60,000-100,000 miles
What happens:
The N52B30's valve stem seals harden and lose their sealing ability over time, leading to excessive oil consumption and blue smoke on startup. Consumption of 1 litre per 500 miles is not uncommon on affected engines. Symptoms include a puff of blue smoke when starting from cold, rising oil consumption, and fouled spark plugs.
Repair vs replace:
Valve stem seals can be replaced without removing the cylinder head using specialist tools (around 12-15 hours labour). This is significantly cheaper than a full engine replacement and should be the first port of call for oil consumption issues on an otherwise healthy engine. Read our full valve stem seal failure guide
Read more about this issue
2. Valvetronic motor and eccentric shaft wear
2. Valvetronic motor and eccentric shaft wear
Typical onset:
80,000-120,000 miles
What happens:
The N52's Valvetronic II system uses an electric motor and eccentric shaft to vary valve lift continuously. The Valvetronic motor can fail, the eccentric shaft bearings can wear, and the sensor can develop faults - leading to rough idle, starting issues, and loss of power. In cold weather, the motor can seize, causing a crank-but-no-start situation.
Repair vs replace:
The Valvetronic motor, eccentric shaft sensor and valve cover gasket are replaceable as a set (around £800-£1,200 at an independent specialist). This is a well-understood repair that does not require engine replacement.
Read more about this issue
3. VANOS solenoid and cam bearing ledge wear
3. VANOS solenoid and cam bearing ledge wear
Typical onset:
60,000-100,000 miles
What happens:
The N52's Double-VANOS system can suffer from solenoid failure or, more seriously, cam bearing ledge wear. Symptoms include fluctuating idle, hesitation below 2,000 RPM, VANOS fault codes (2A82 intake, 2A87 exhaust), and reduced low-end torque.
Repair vs replace:
VANOS solenoids can be cleaned or replaced (around £200-£400). If the cam bearing ledges are worn, the repair is more involved - the camshaft bearing caps may need replacement (around £800-£1,500). This is a preventative maintenance item that should be addressed before it causes timing issues.
Read more about this issue
The N52B30 is widely regarded as one of BMW's most reliable modern engines - often described as "bulletproof" by owners. The 2005-2006 N52B30 (without direct injection) is considered more reliable than the later N53B30 that replaced it, which suffered from injector and high-pressure fuel pump issues. With proper maintenance, N52B30 engines regularly exceed 200,000 miles.
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Engine Variants
How to Confirm You Have the N52B30
The N52B30 is a specific engine code within the N52 family. Unlike some BMW engines that fragment into many sub-codes with different hardware, the N52B30's variants are primarily distinguished by power output and market-specific tuning. The N52 family includes: - N52B30O0 - 258 hp (190 kW) @ 6,600 rpm, 300 Nm torque. Base engine with 3-Stage DISA intake manifold. Fitted to most 330i, 530i, 630i and X3 3.0si applications. This is the most common UK variant. - N52B30A - 258-272 hp. The "A" designation typically indicates European-market tuning with 3-Stage DISA. - N52B30B - 218 hp (160 kW) @ 6,100 rpm, 270 Nm torque. Lower-output variant fitted to some 525i, 325i and 730i models. - N52B30BF / N52B30AF - Regional variants for specific markets (e.g. North America) with different emissions calibration. - N52B30O1 - Higher-output 272 hp variant fitted to some X3 xDrive30i and 130i models. How to confirm your code: 1. On the engine - the N52B30 code is stamped on the engine block, below the intake manifold directly between the knock sensors. Look for "N52B30A", "N52B30B", "N52B30O0" or similar. 2. On the V5C logbook - the engine number is listed; cross-reference with BMW parts systems. 3. VIN decode - use a BMW VIN decoder; the engine type will be shown. 4. Registration lookup - enter your reg above and we'll confirm the exact fitment. Similar-looking codes it is commonly confused with: - BMW N52B25 - the 2.5-litre version of the N52 family, fitted to 325i and 525i models; shares the same architecture but smaller displacement - BMW N53B30 - the direct-injection successor; not a direct swap due to different fuel system and engine management - BMW M54B30 - the predecessor; different block material (iron vs magnesium-aluminium) and no Valvetronic
Why fitting the wrong revision matters: The N52B30O0 (258 hp) and N52B30B (218 hp) are physically similar but have different DISA intake manifolds, ECU tuning, and in some cases different compression ratios. An N53B30 (direct injection) is not a direct swap due to different fuel system, injectors, and engine management. The N52's magnesium-aluminium block is also unique to this engine family.
Easily Confused
N52
The N52B30 is a specific engine code within the N52 family. Unlike some BMW engines that fragment into many sub-codes with different hardware, the N52B30's variants are primarily distinguished by power output and market-specific tuning.
Alternative / Next-Gen Code
N52B30O0
- N52B30O0 - 258 hp (190 kW) @ 6,600 rpm, 300 Nm torque. Base engine with 3-Stage DISA intake manifold. Fitted to most 330i, 530i, 630i and X3 3.0si applications. This is the most common UK variant.
Related JLR Variants
N52B30A
- N52B30A - 258-272 hp. The "A" designation typically indicates European-market tuning with 3-Stage DISA.
Confirm the exact N52B30 fitment
Why fitting the wrong revision matters: The N52B30O0 (258 hp) and N52B30B (218 hp) are physically similar but have different DISA intake manifolds, ECU tuning, and in some cases different compression ratios. An N53B30 (direct injection) is not a direct swap due to different fuel system, injectors, and engine management. The N52's magnesium-aluminium block is also unique to this engine family.
Buying Guide
Buying a Replacement N52B30 - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used N52B30 makes sense for lower-value E90 330i or E60 530i examples where the car itself is worth under £3,000-£4,000. The key requirement is documented service history with BMW LL-01 5W-30 or 5W-40 oil, and evidence that the valve stem seals have been addressed if over 80,000 miles. The primary risk with used units is undisclosed oil consumption from valve stem seal wear - insist on a cold start smoke test and compression check before purchase. Used units typically cost £1,500-£2,800. View used engines
Reconditioned:
A proper N52B30 recon includes new valve stem seals, full VANOS solenoid service or replacement, Valvetronic motor inspection and replacement if worn, new valve cover gasket, new oil filter housing gasket, new water pump and thermostat, and full gasket set. This is the right call for most replacements - you get a like-new unit with the known weak points already addressed, backed by 12-24 months warranty. Reconditioned units typically cost £2,800-£3,600. View reconditioned engines
Rebuilt:
A full rebuild is justified for high-value, collectable or low-mileage E63 630i, Z4 3.0si or limited-production models where originality matters. An upgraded rebuild should include new timing chain guides, new oil pump chain, new piston rings, and a full set of bearings. For standard applications, reconditioned is usually more cost-effective. View rebuilt engines
Supply & Fit Line:
All engines can be supplied and fitted through our network of vetted UK BMW specialists - nationwide coverage with 12-month warranty on labour and parts. View supply & fit
Vehicle Value Note:
The N52B30 sits in 2000s BMWs - E90 330i (£2,000-£7,000), E60 530i (£2,000-£6,000), E63 630i (£3,000-£9,000), E83 X3 3.0si (£2,000-£5,000). A £3,500-£5,000 reconditioned engine plus £1,000-£1,500 fitting is a significant investment - for lower-value examples (sub-£3,500 330i or 530i), a used engine with documented valve stem seal work may be more economic. For collectable 130i, Z4 3.0si or low-mileage examples, the investment is usually justified. The N52B30 is a well-supported engine with strong parts availability, making replacement a viable option for most owners who want to keep their car on the road.
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Related Engines
Related Engines
Explore engines that are closely related to the BMW N52B30, including its predecessor, successor, and key family variants.
Predecessor
M54B30 (predecessor)
M54B30 (predecessor)
Successor
N53B30 (Europe) / N20 turbo (later)
N53B30 (Europe) / N20 turbo (later)
Sibling
N52
The N52B30 is a specific engine code within the N52 family. Unlike some BMW engines that fragment into many sub-codes with different hardware, the N52B30's variants are primarily distinguished by power output and market-specific tuning.
Sibling
N52B30O0
- N52B30O0 - 258 hp (190 kW) @ 6,600 rpm, 300 Nm torque. Base engine with 3-Stage DISA intake manifold. Fitted to most 330i, 530i, 630i and X3 3.0si applications. This is the most common UK variant.
FAQ
BMW N52B30Frequently Asked Questions
Question 1How much does a BMW N52B30 engine replacement cost in the UK-
A reconditioned N52B30 supply-only costs around £3,500-£5,000, with fitted prices at £4,500-£6,500 including 10-14 hours of labour at independent BMW specialist rates (£65-£85/hr). Used units start at £1,500 supply-only. Reconditioned units include new valve stem seals, VANOS solenoids, water pump and gaskets. Prices estimated based on specialist-market consensus for BMW straight-six engines. Fitted prices include 12-month warranty on parts and labour.
- Reconditioned units include new valve stem seals, VANOS solenoids, water pump and gaskets
- Prices estimated based on specialist-market consensus for BMW straight-six engines
- Fitted prices include 12-month warranty on parts and labour
Question 2What are the common problems with the BMW N52B30 engine-
The N52B30's most common issues are valve stem seal wear (causing oil consumption and blue smoke on startup), Valvetronic motor failure, and VANOS solenoid/cam bearing ledge wear. The N52 is generally considered reliable, but these issues require attention at higher mileages. Valve stem seal replacement is the most common repair. Valvetronic motor failure can cause starting issues in cold weather. Regular maintenance is essential for longevity.
- Valve stem seal replacement is the most common repair
- Valvetronic motor failure can cause starting issues in cold weather
- Regular maintenance is essential for longevity
Question 3Which BMW models use the N52B30 engine-
The N52B30 powered the E81/E82/E87/E88 130i, E90/E91/E92/E93 330i/325i (US), E60/E61 530i/525i (US), E63/E64 630i, E65/E66 730i, E83 X3 3.0si, E70 X5 3.0si, and E85/E86 Z4 3.0i/3.0si. The 258 hp variant is the most common UK application. E90 330i is the most common UK application. 130i and Z4 3.0si are the most collectable. Enter your registration to confirm exact fitment.
- E90 330i is the most common UK application
- 130i and Z4 3.0si are the most collectable
- Enter your registration to confirm exact fitment
Question 4Should I buy a used or reconditioned N52B30 engine-
A used N52B30 makes sense only with documented service history using BMW LL-01 oil and evidence of valve stem seal replacement if over 80,000 miles. A reconditioned unit is safer, as it includes new valve stem seals, VANOS solenoids and gaskets with 12-24 months warranty, typically costing £3,500-£5,000 supply-only. Used engines risk undisclosed oil consumption. Cold start smoke test is essential before purchase. Reconditioned units address known failure points.
- Used engines risk undisclosed oil consumption
- Cold start smoke test is essential before purchase
- Reconditioned units address known failure points
Question 5How do I know if my BMW has the N52B30 engine-
The N52B30 is stamped on the engine block below the intake manifold, between the knock sensors. Look for "N52B30A", "N52B30B" or "N52B30O0" on the identification plate. You can also decode your VIN - BMW models with N52B30 show this engine code in parts systems. Enter your registration above for confirmation. The V5C logbook lists the engine number. BMW VIN decoders distinguish N52B30 from N53B30. The N52B30 uses port injection, not direct injection.
- The V5C logbook lists the engine number
- BMW VIN decoders distinguish N52B30 from N53B30
- The N52B30 uses port injection, not direct injection
Question 6Is the N52B30 a reliable engine-
Yes - the N52B30 is widely regarded as one of BMW's most reliable modern engines, often described as "bulletproof" by owners. With proper maintenance (regular oil changes using BMW LL-01 spec, cooling system attention, and preventative VANOS service), N52B30 engines regularly exceed 200,000 miles. The 2005-2006 N52B30 is considered more reliable than the later N53B30 that replaced it, which suffered from injector and HPFP issues. N52 is significantly more reliable than the N53 direct-injection engine. Valve stem seals are the main weakness but are repairable. Regular maintenance is the key to longevity.
- N52 is significantly more reliable than the N53 direct-injection engine
- Valve stem seals are the main weakness but are repairable
- Regular maintenance is the key to longevity
Compare BMW N52B30 Engine Prices Today
Comparing N52B30 engine prices on EnginesMarket is free, fast and carries no obligation. Enter your registration once and receive quotes specific to your E90 330i, E60 530i, E63 630i or E83 X3 3.0si's exact engine code and variant. Our vetted UK suppliers understand the N52's valve stem seal and Valvetronic challenges - no guesswork, no generic quotes. With reconditioned N52B30 units from around £3,500 and used units from £1,500, comparing takes two minutes and could save you thousands on a quality replacement for BMW's legendary naturally aspirated straight-six.
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