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BMW S63B44T3 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The BMW S63B44T3 is the latest evolution of BMW's 4.4-litre twin-turbo V8, fitted to the F90 M5, F92 M8 and G05/G06 X5M/X6M from 2018 onwards. Reconditioned S63B44T3 units are available from around £9,000 ; the S63 family generated approximately 410 UK replacement requests in 2025 [EM-VERIFIED].
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Key Specs
BMW S63B44T3 - Specifications at a Glance
Engine Code
S63B44T3 (S63N)
Fuel
Petrol
Configuration
4.4L V8, twin-turbo, DOHC, 32-valve
Power Output(s)
592-625 hp (varies by model; M5 Competition: 625 hp, X5M/X6M: 625 hp, M8: 600-625 hp)
Years Produced
2018-present
UK Models Fitted
5 models - full list in Compatibility below
2025 UK Replacement Requests
410 [EM-VERIFIED] (S63 family total)
Replaced
S63B44T2 - BMW S63B44T2 Engine
Replaced By
- (current production; S68 replacing gradually)
Most Common Failure
Cooling system leaks / turbocharger issues
Reconditioned Price Range
£9,000-£14,000 supply-only
Vetted UK specialists for S63B44T3 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which BMW Models Use the S63B44T3-
The S63B44T3 is BMW's most powerful mass-production V8, fitted across the M-division's premium saloon, coupé and SUV ranges from 2018 onwards. It represents the final evolution of the S63 family before the S68 hybrid V8 takes over.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 BMW M5 | F90 | M5, M5 Competition, M5 CS | 2018-2023 | |
| BMW M8 | F92 / F93 / F91 | M8, M8 Competition, M8 Gran Coupé | 2019-present | |
| BMW X5 M | G05 / F95 | X5 M, X5 M Competition | 2020-present | |
| BMW X6 M | G06 / F96 | X6 M, X6 M Competition | 2020-present | |
| BMW XM | G09 | XM, XM Label Red | 2022-present |
02
BMW M8
Generation/Chassis
F92 / F93 / F91
Badge(s)
M8, M8 Competition, M8 Gran Coupé
Years
2019-present
Link
03
BMW X5 M
04
BMW X6 M
05
BMW XM
CROSS-BRAND
S63B44T3 is documented across 5 BMW applications spanning BMW M5, BMW M8, BMW X5 M, BMW X6 M, BMW XM. 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 S63B44T3 fitment before any quotes are sent.
Prices
BMW S63B44T3 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|
All pricing guidance shown here is indicative.
Labour Guide
Fitting an S63B44T3 typically takes 18-24 hours at £75-£95/hr (independent BMW M specialist) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
BMW S63B44T3 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the S63B44T3, based on real-world data and verified failure patterns.
Verified issue focus: Cooling system leaks / turbocharger issues.
1. Cooling system failures - hot-vee heat management
1. Cooling system failures - hot-vee heat management
Typical onset:
60,000-100,000 miles
What happens:
The S63's hot-vee design (turbochargers mounted in the V of the engine) generates significant heat, placing the cooling system under constant stress. Common failures include coolant leaks from the expansion tank, water pump failure, and cracked coolant hoses around the turbochargers. Coolant loss can lead to overheating and, if ignored, head gasket failure.
Repair vs replace:
Coolant system components (water pump, expansion tank, hoses) are individually replaceable - usually £500-£1,500 depending on which parts have failed. A full engine replacement is not typically required for cooling issues alone, though overheating can cause additional damage. Read our full coolant system failure guide
Read more about this issue
2. Turbocharger issues - wastegate rattle / oil supply
2. Turbocharger issues - wastegate rattle / oil supply
Typical onset:
60,000-100,000 miles
What happens:
The twin-turbochargers on the S63B44T3 can develop wastegate rattle (a metallic noise at low RPM), caused by wear in the wastegate bushings. Oil supply issues to the turbos can also occur if oil changes have been neglected, leading to turbo failure.
Repair vs replace:
Wastegate rattle can sometimes be addressed with a wastegate repair kit, though full turbo replacement (around £2,000-£4,000 each) is common on higher-mileage examples.
Read more about this issue
3. Valve stem seals - oil consumption
3. Valve stem seals - oil consumption
Typical onset:
80,000-120,000 miles
What happens:
Like many turbocharged BMW V8s, the S63 can develop valve stem seal wear, leading to oil consumption, blue smoke on startup, and fouled spark plugs. This is a labour-intensive repair as the cylinder heads must be removed.
Repair vs replace:
Valve stem seal replacement is a substantial job (around £2,000-£4,000) but far cheaper than a full engine replacement. Many owners also address the coolant system and turbo oil lines while the engine is partially dismantled.
Read more about this issue
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Engine Variants
How to Confirm You Have the S63B44T3
The S63B44T3 is a specific engine code within the S63 family, representing the third major technical revision (T3) of BMW's 4.4-litre twin-turbo V8. The S63 family includes: - S63B44 - original 2009-2013 (M5 F10, X5M/X6M E70/E71) - 555-560 hp - S63B44T2 - 2013-2018 (M5 F10 LCI, X5M/X6M F15/F16) - 575-600 hp - S63B44T3 - 2018-present (M5 F90, M8, X5M/X6M G05/G06) - 592-625 hp - S63TU - Family page covering multiple S63 variants How to confirm your code: 1. On the engine - the S63B44T3 code is stamped on the engine block. Look for "S63N" or "S63B44T3" on the identification plate on the left-hand side of the engine. 2. On the V5C logbook - the engine number is listed; cross-reference with BMW parts systems. 3. VIN decode - use a BMW VIN decoder; F90 M5, F92 M8 and G05/G06 X5M/X6M vehicles show engine type "S63B44T3". 4. Registration lookup - enter your reg above and we'll confirm the exact fitment. Similar-looking codes it is commonly confused with: - BMW S63B44T2 - the previous generation, fitted to F10 M5 LCI and F15/F16 X5M/X6M; not a direct swap - BMW S63B44 - the original 2009-2013 version; significant differences in cooling, turbo and ECU - BMW S63TU - Family page covering the S63 evolution
Why fitting the wrong revision matters: The S63B44T3 has revised turbochargers, an updated cooling system, different engine management and revised internal components compared to earlier S63 variants. An S63B44 or S63B44T2 is not a direct swap into a T3 vehicle without significant modifications to the cooling, electrical and drivetrain systems.
Easily Confused
S63
The S63B44T3 is a specific engine code within the S63 family, representing the third major technical revision (T3) of BMW's 4.4-litre twin-turbo V8. The S63 family includes:
Alternative / Next-Gen Code
S63B44
- S63B44 - original 2009-2013 (M5 F10, X5M/X6M E70/E71) - 555-560 hp
Related JLR Variants
F10
- S63B44 - original 2009-2013 (M5 F10, X5M/X6M E70/E71) - 555-560 hp
Confirm the exact S63B44T3 fitment
Why fitting the wrong revision matters: The S63B44T3 has revised turbochargers, an updated cooling system, different engine management and revised internal components compared to earlier S63 variants. An S63B44 or S63B44T2 is not a direct swap into a T3 vehicle without significant modifications to the cooling, electrical and drivetrain systems.
Buying Guide
Buying a Replacement S63B44T3 - 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 S63B44T3 makes sense only if the donor has documented service history with BMW LL-01 FE oil, low mileage (under 50,000 miles), and evidence that the cooling system and turbo oil lines have been maintained. The primary risk with used units is undisclosed coolant system wear - insist on a pressure test and turbo inspection before purchase. For lower-value F90 M5 or X5M examples, a used unit with documented history can be a cost-effective option. View used engines
Reconditioned:
A proper S63B44T3 recon addresses the cooling system (new water pump, expansion tank, hoses), replaces the turbochargers or rebuilds wastegate components, fits new valve stem seals and gaskets, and checks the timing chain tensioners. 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 M cars where originality matters. An upgraded rebuild should include upgraded turbochargers, improved cooling system components, and forged internals if tuning is planned. 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 M specialists - nationwide coverage with 12-month warranty on labour and parts. View supply & fit
Vehicle Value Note:
The S63B44T3 sits exclusively in high-performance M cars - F90 M5 (£25,000-£60,000+), M8 (£40,000-£100,000+), X5M/X6M (£40,000-£80,000+). A £9,000-£14,000 reconditioned engine plus £1,500-£2,500 fitting is a significant but often justifiable investment - typically 20-40% of the vehicle's value. For lower-value examples (sub-£25,000 M5s or higher-mileage X5Ms), carefully evaluate the car's overall condition, service history and specification before committing. For collectable Competition or CS models, the investment is almost always justified given the rarity and value of the car.
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Related Engines
Related Engines
Explore engines that are closely related to the BMW S63B44T3, including its predecessor, successor, and key family variants.
Predecessor
S63B44T2
S63B44T2 - BMW S63B44T2 Engine
Sibling
S63
The S63B44T3 is a specific engine code within the S63 family, representing the third major technical revision (T3) of BMW's 4.4-litre twin-turbo V8. The S63 family includes:
Sibling
S63B44
- S63B44 - original 2009-2013 (M5 F10, X5M/X6M E70/E71) - 555-560 hp
Sibling
F10
- S63B44 - original 2009-2013 (M5 F10, X5M/X6M E70/E71) - 555-560 hp
FAQ
BMW S63B44T3Frequently Asked Questions
Question 1How much does a BMW S63B44T3 engine replacement cost in the UK-
A reconditioned S63B44T3 supply-only costs around £9,000-£14,000, with fitted prices at £10,500-£16,000 including 18-24 hours of labour at BMW M specialist rates (£75-£95/hr). Used units start at £7,000 supply-only. Reconditioned units include new cooling system components, turbo work and gaskets. Prices estimated using S63B44 as proxy. Fitted prices include 12-month warranty on parts and labour.
- Reconditioned units include new cooling system components, turbo work and gaskets
- Prices estimated using S63B44 as proxy
- Fitted prices include 12-month warranty on parts and labour
Question 2What are the common problems with the BMW S63B44T3 engine-
The S63B44T3's main issues are cooling system failures (water pump, expansion tank, hoses - due to the hot-vee turbo layout), turbocharger wastegate rattle and oil supply issues, and valve stem seal wear leading to oil consumption at higher mileage. Cooling system components are the most common failure point. Turbocharger issues typically appear at 60,000-100,000 miles. Preventative maintenance is essential for longevity.
- Cooling system components are the most common failure point
- Turbocharger issues typically appear at 60,000-100,000 miles
- Preventative maintenance is essential for longevity
Question 3Which BMW models use the S63B44T3 engine-
The S63B44T3 powers the F90 M5 and M5 Competition (2018-2023), F92/F93/F91 M8 and M8 Competition (2019-present), G05/F95 X5 M and X5 M Competition (2020-present), G06/F96 X6 M and X6 M Competition (2020-present), and the G09 XM (2022-present). All UK-market S63B44T3 examples are 592-625 hp variants. Engine code is stamped on the block as "S63N" or "S63B44T3". Enter your registration to confirm exact fitment.
- All UK-market S63B44T3 examples are 592-625 hp variants
- Engine code is stamped on the block as "S63N" or "S63B44T3"
- Enter your registration to confirm exact fitment
Question 4Should I buy a used or reconditioned S63B44T3 engine-
A used S63B44T3 is only worth considering with documented service history using BMW LL-01 FE oil, low mileage (under 50,000 miles), and evidence of cooling system and turbo maintenance. A reconditioned unit is safer, as it includes new cooling system components, turbo work and seals with 12-24 months warranty, typically costing £9,000-£14,000 supply-only. Used engines risk undisclosed coolant or turbo issues. Reconditioned units address known failure points. For high-value M cars, reconditioned is strongly recommended.
- Used engines risk undisclosed coolant or turbo issues
- Reconditioned units address known failure points
- For high-value M cars, reconditioned is strongly recommended
Question 5How do I know if my BMW has the S63B44T3 engine-
The S63B44T3 is stamped on the engine block (left-hand side) with "S63N" or "S63B44T3" on the identification plate. You can also decode your VIN - F90 M5, F92 M8 and G05/G06 X5M/X6M vehicles show engine type "S63B44T3". Enter your registration above for confirmation. The V5C logbook lists the engine number. BMW VIN decoders distinguish T3 from T2 and original S63. All 2018+ F90 M5s use the T3 revision.
- The V5C logbook lists the engine number
- BMW VIN decoders distinguish T3 from T2 and original S63
- All 2018+ F90 M5s use the T3 revision
Question 6Is the S63B44T3 more reliable than earlier S63 engines-
Yes - the S63B44T3 (2018-onwards) is significantly more reliable than earlier S63 and N63 engines (2009-2017). BMW made substantial revisions to the cooling system, turbocharger design, valve stem seals and engine management for the T3 generation. However, cooling system maintenance and regular oil changes remain critical for longevity. Earlier engines suffered from timing chain, valve seal and turbo coolant issues. T3 revisions addressed the major weak points. Regular maintenance is still essential for reliability.
- Earlier engines suffered from timing chain, valve seal and turbo coolant issues
- T3 revisions addressed the major weak points
- Regular maintenance is still essential for reliability
Compare BMW S63B44T3 Engine Prices Today
Comparing S63B44T3 engine prices on EnginesMarket is free, fast and carries no obligation. Enter your registration once and receive quotes specific to your M car's exact engine code and specification. Our vetted UK suppliers understand the S63's hot-vee cooling challenges and turbo maintenance requirements - no guesswork, no generic quotes. With reconditioned S63B44T3 units from around £9,000 and used units from £7,000, comparing takes two minutes and could save you thousands on a high-quality replacement for your M5, M8 or X5M.
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Vetted UK specialists for S63B44T3 replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
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