01
BMW N62B44 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The BMW N62B44 is a 4.4-litre naturally aspirated V8 from BMW's N62 family, fitted to the E53 X5 4.4i, E63/E64 6 Series 645Ci and E65/E66 7 Series 745i from 2002 to 2010. Reconditioned N62B44 units are available from around £4,500 .
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
GB
Secure enquiry - no spam.
Quotes only from vetted UK engine specialists.
Key Specs
BMW N62B44 - Specifications at a Glance
Engine Code
N62B44 (N62B44A / N62B44B)
Fuel
Petrol
Configuration
4.4L V8, naturally aspirated, DOHC, 32-valve, VANOS
Power Output(s)
333-342 hp (varies by model and year); 450 Nm torque
Years Produced
2002-2010
UK Models Fitted
4 model families - full list in Compatibility below
2025 UK Replacement Requests
[Not available in proprietary data]
Replaced
M62B44
Replaced By
N63B44 (turbocharged)
Most Common Failure
Valve stem seals (oil consumption) / coolant system leaks
Reconditioned Price Range
£4,500-£6,500 supply-only
Vetted UK specialists for N62B44 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which BMW Models Use the N62B44-
The N62B44 was BMW's mainstream 4.4-litre V8 throughout the 2000s, fitted across the 5 Series, 6 Series, 7 Series and X5 range. It was BMW's first V8 with continuously variable VANOS on both intake and exhaust camshafts.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 BMW 5 Series | E60 / E61 | 545i | 2002-2005 | |
 BMW 6 Series | E63 / E64 | 645Ci | 2003-2005 | |
| BMW 7 Series | E65 / E66 | 745i, 745Li | 2002-2005 | |
| BMW X5 | E53 | 4.4i | 2002-2006 |
02
BMW 6 Series
03
BMW 7 Series
04
BMW X5
CROSS-BRAND
N62B44 is documented across 4 BMW applications spanning BMW 5 Series, BMW 6 Series, BMW 7 Series, BMW X5. Registration lookup confirms the exact suffix before quotes are sent.
Not sure which engine your car has?
Not sure which engine your car has- Enter your registration above - we'll confirm your exact N62B44 fitment before any quotes are sent.
Prices
BMW N62B44 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|
All pricing guidance shown here is indicative.
Labour Guide
Fitting an N62B44 typically takes 14-18 hours at £65-£85/hr (independent BMW specialist) - confirm exact labour when comparing quotes.
Price Factors
Ready to compare N62B44 quotes?
Get competitive quotes from trusted UK specialists today.
Common Problems
BMW N62B44 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the N62B44, based on real-world data and verified failure patterns.
Verified issue focus: Valve stem seals (oil consumption) / coolant system leaks.
1. Valve stem seal failure - oil consumption
1. Valve stem seal failure - oil consumption
Typical onset:
60,000-100,000 miles
What happens:
The N62 is notorious for valve stem seal wear, leading to excessive oil consumption and blue smoke on startup. This is the single most common issue across the N62 family and is caused by the valve stem seals hardening and losing their sealing ability. Symptoms include oil consumption of 1 litre per 1,000 miles or more, blue smoke when starting from cold, and fouled spark plugs.
Repair vs replace:
Valve stem seal replacement is a substantial job (around £1,500-£3,000) but far cheaper than a full engine replacement. Many owners also address the coolant system and alternator bracket gasket while the intake manifold is off. Read our full valve stem seal failure guide
Read more about this issue
2. Alternator bracket gasket leak
2. Alternator bracket gasket leak
Typical onset:
80,000-120,000 miles
What happens:
The alternator bracket gasket is a known failure point on the N62. When it fails, oil leaks from the bracket and can drip onto the exhaust, causing a burning smell. In severe cases, it can lead to oil pressure issues.
Repair vs replace:
The gasket is replaceable (around £300-£600 at an independent specialist) - it's a labour-intensive job but not engine-replacing.
Read more about this issue
3. Cooling system leaks
3. Cooling system leaks
Typical onset:
60,000-100,000 miles
What happens:
The N62's cooling system is under significant stress, with coolant leaks from the expansion tank, radiator, water pump and coolant pipes being common. The V8 layout and tight engine bay make access challenging.
Repair vs replace:
Individual components are replaceable; a full cooling system overhaul (water pump, thermostat, expansion tank, hoses) is often the most cost-effective approach at higher mileages.
Read more about this issue
Compare quotes
Engine Variants
N62B44 Sub-Codes Explained - Which One Is in Your Car-
The N62 family consists of several displacement variants. Within the N62B44, there are two main sub-variants distinguished by power output and model application. INTRO: The N62B44 covers several closely related 4.4-litre V8 variants. The critical difference is the power output and which model family the engine was fitted to. - Fitted to: E65 745i / 745Li, E53 X5 4.4i (pre-facelift), E60 545i - Key technical difference: 333 hp (245 kW) @ 6,100 rpm; 450 Nm torque. This is the original N62B44 specification, with standard VANOS and a 10.5:1 compression ratio. - Sub-code-specific failure note: Shares the family failure pattern above - valve stem seals, alternator bracket gasket, cooling system. The 333 hp variant is the most common N62B44 in the UK. - Interchange note: The N62B44A is interchangeable with N62B44B with appropriate ECU and engine management adjustments. - Fitted to: E63/E64 645Ci, E60 545i (late), some post-facelift E53 X5 4.4i - Key technical difference: 342 hp (252 kW) @ 6,100 rpm; 450 Nm torque. The power increase comes from revised engine mapping, improved intake and exhaust flow, and slightly higher compression in some versions. - Sub-code-specific failure note: Shares the family failure pattern above. Later production (2007-2010) may have improved valve stem seal materials, but the failure remains common. - Interchange note: The N62B44B is a direct swap for N62B44A with ECU programming. Also shares ancillaries with the N62B48 (4.8-litre) in some applications. RELATED FAMILY MEMBERS: - N62B40 - 4.0-litre variant, fitted to E65 735i and E53 X5 4.0i - N62B48 - 4.8-litre variant, fitted to E70 X5 4.8i, E63 650i and E66 750i Similar-looking codes it is commonly confused with: - BMW N62B48 - the 4.8-litre version, fitted to 650i and 750i models; similar architecture but larger displacement and higher power - BMW N62B40 - the 4.0-litre version, fitted to E65 735i; not a direct swap - BMW N63B44 - the turbocharged successor; completely different hot-vee architecture
The N62B44 code is stamped on the engine block - look for "N62B44A" or "N62B44B" on the identification plate on the left-hand side of the engine. The V5C logbook lists the engine number. A BMW VIN decoder can also confirm which variant your car has. Enter your registration above for confirmation.
Easily Confused
N62
The N62 family consists of several displacement variants. Within the N62B44, there are two main sub-variants distinguished by power output and model application.
Alternative / Next-Gen Code
E65
- Fitted to: E65 745i / 745Li, E53 X5 4.4i (pre-facelift), E60 545i
Related JLR Variants
E53
- Fitted to: E65 745i / 745Li, E53 X5 4.4i (pre-facelift), E60 545i
Confirm the exact N62B44 fitment
The N62B44 code is stamped on the engine block - look for "N62B44A" or "N62B44B" on the identification plate on the left-hand side of the engine. The V5C logbook lists the engine number. A BMW VIN decoder can also confirm which variant your car has. Enter your registration above for confirmation.
Buying Guide
Buying a Replacement N62B44 - 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 N62B44 makes sense only with documented service history using BMW LL-01 5W-30 or 5W-40 oil, evidence of valve stem seal replacement if over 80,000 miles, and a coolant system that has been maintained. The primary risk with used units is undisclosed valve stem seal wear (oil consumption) - insist on a cold start smoke test and compression check before purchase. For lower-value E53 X5 or E65 7 Series examples (sub-£3,000), a used engine with documented history can be a cost-effective option. View used engines
Reconditioned:
A proper N62B44 recon includes new valve stem seals, alternator bracket gasket, full cooling system overhaul (water pump, thermostat, expansion tank, hoses), VANOS seals and all gaskets. 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. View reconditioned engines
Rebuilt:
A full rebuild is justified for high-value, collectable or low-mileage E63 6 Series, E60 M5 (N62-related) or limited-production models where originality matters. 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 N62B44 sits in 2000s BMWs - E60 545i (£2,000-£7,000), E63 645Ci (£3,000-£10,000), E65 745i (£2,000-£6,000), E53 X5 4.4i (£2,000-£5,000). A £4,500-£6,500 reconditioned engine plus £1,000-£1,500 fitting is a significant investment - for lower-value examples (sub-£3,500 X5 or 7 Series), a used engine with documented valve stem seal work may be more economic. For collectable 645Ci or low-mileage examples, the investment is usually justified. Always evaluate the whole-vehicle condition before committing.
Compare N62B44 Engine Prices Now
Related Engines
Related Engines
Explore engines that are closely related to the BMW N62B44, including its predecessor, successor, and key family variants.
Predecessor
M62B44
M62B44
Successor
N63B44 (turbocharged)
N63B44 (turbocharged)
Sibling
N62
The N62 family consists of several displacement variants. Within the N62B44, there are two main sub-variants distinguished by power output and model application.
Sibling
E65
- Fitted to: E65 745i / 745Li, E53 X5 4.4i (pre-facelift), E60 545i
FAQ
BMW N62B44Frequently Asked Questions
Question 1How much does a BMW N62B44 engine replacement cost in the UK-
A reconditioned N62B44 supply-only costs around £4,500-£6,500, with fitted prices at £5,500-£8,200 including 14-18 hours of labour at independent BMW specialist rates (£65-£85/hr). Used units start at £2,500 supply-only. Reconditioned units include new valve stem seals, alternator bracket gasket and cooling system components. Prices estimated based on specialist-market consensus for 2000s BMW V8s. Fitted prices include 12-month warranty on parts and labour.
- Reconditioned units include new valve stem seals, alternator bracket gasket and cooling system components
- Prices estimated based on specialist-market consensus for 2000s BMW V8s
- Fitted prices include 12-month warranty on parts and labour
Question 2What are the common problems with the BMW N62B44 engine-
The N62B44's most notorious issue is valve stem seal failure, causing excessive oil consumption and blue smoke on startup. Other common problems include alternator bracket gasket leaks (oil leaks onto the exhaust) and cooling system leaks from the expansion tank, water pump and coolant pipes. Valve stem seal failure is the most common reason for N62 replacement. Alternator bracket gasket leak is a known weak point. Cooling system overhaul is recommended at 80,000+ miles.
- Valve stem seal failure is the most common reason for N62 replacement
- Alternator bracket gasket leak is a known weak point
- Cooling system overhaul is recommended at 80,000+ miles
Question 3Which BMW models use the N62B44 engine-
The N62B44 powered the E60/E61 545i (2002-2005), E63/E64 645Ci (2003-2005), E65/E66 745i and 745Li (2002-2005), and the E53 X5 4.4i (2002-2006). The N62B44A is the 333 hp variant, while the N62B44B is the 342 hp variant. E53 X5 4.4i is the most common UK application. E63 645Ci is the most collectable. Enter your registration to confirm exact fitment.
- E53 X5 4.4i is the most common UK application
- E63 645Ci is the most collectable
- Enter your registration to confirm exact fitment
Question 4Should I buy a used or reconditioned N62B44 engine-
A used N62B44 is only worth considering with documented valve stem seal replacement (if over 80,000 miles) and evidence of cooling system maintenance. A reconditioned unit is safer, as it includes new valve stem seals, gaskets and cooling system components with 12-24 months warranty, typically costing £4,500-£6,500 supply-only. Used engines risk undisclosed valve stem seal wear. Cold start smoke test is essential before purchase. Reconditioned units address known failure points.
- Used engines risk undisclosed valve stem seal wear
- Cold start smoke test is essential before purchase
- Reconditioned units address known failure points
Question 5How do I know if my BMW has the N62B44 engine-
The N62B44 is stamped on the engine block - look for "N62B44A" or "N62B44B" on the identification plate on the left-hand side of the engine. You can also decode your VIN - BMW models with N62B44 show this engine code in parts systems. Enter your registration above for confirmation. The V5C logbook lists the engine number. BMW VIN decoders distinguish A and B variants. Later N62TU variants may have improved materials.
- The V5C logbook lists the engine number
- BMW VIN decoders distinguish A and B variants
- Later N62TU variants may have improved materials
Question 6Is the N62B44 more reliable than the N63B44-
The N62B44 is generally considered more reliable than the later N63B44 hot-vee turbo V8. The N62's naturally aspirated design is simpler and more accessible for repairs, while the N63's hot-vee layout generates significant heat that can cause valve stem seal, turbo coolant line and battery drain issues. However, the N62 has its own well-documented valve stem seal and cooling system problems. N62 is simpler and cheaper to maintain than N63. N63 offers more power but more complexity. Both require careful maintenance for longevity.
- N62 is simpler and cheaper to maintain than N63
- N63 offers more power but more complexity
- Both require careful maintenance for longevity
Compare BMW N62B44 Engine Prices Today
Comparing N62B44 engine prices on EnginesMarket is free, fast and carries no obligation. Enter your registration once and receive quotes specific to your E60 545i, E63 645Ci, E65 745i or E53 X5 4.4i's exact engine code and variant. Our vetted UK suppliers understand the N62's valve stem seal and cooling system challenges - no guesswork, no generic quotes. With reconditioned N62B44 units from around £4,500 and used units from £2,500, comparing takes two minutes and could save you thousands on a quality replacement for your V8-powered BMW.
Vetted UK Specialists
Vetted UK specialists for N62B44 replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
Expert Support
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
[Get Free N62B44 Engine Quotes ](#)