BMW X5 40i Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW X5 40i engine specialists. Compare prices on reconditioned, rebuilt and used B58 engines for the G05 X5 40i - supply & fit available nationwide.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £3,800 to £6,800
Used from £2,000 · Reconditioned from £3,200 · Common codes: B58B30C, B58B30M1, B58B30P
From £2,000
Tested, bare/short engine
From £3,200
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW X5 40i Replacement Engineto Finding the Best BMW X5 40i Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW X5 40i - Engine History & Specs at a Glance
The BMW X5 40i was introduced with the fourth-generation G05 X5 in 2018, replacing the previous F15-generation xDrive35i. Powered by the B58 3.0-litre turbocharged straight-six petrol engine - widely regarded as one of BMW's most reliable modern powerplants - the 40i became the entry-level petrol model in the G05 range, offered in both rear-wheel-drive sDrive40i (North America) and all-wheel-drive xDrive40i (UK and global) configurations.
Variant HistoryBMW X5 40i - Engine History & Specs at a Glance
The BMW X5 40i was introduced with the fourth-generation G05 X5 in 2018, replacing the previous F15-generation xDrive35i. Powered by the B58 3.0-litre turbocharged straight-six petrol engine - widely regarded as one of BMW's most reliable modern powerplants - the 40i became the entry-level petrol model in the G05 range, offered in both rear-wheel-drive sDrive40i (North America) and all-wheel-drive xDrive40i (UK and global) configurations.
BMW X5 40i
Fuel TypePetrol (with 48V mild hybrid from 2022)
Engine Size3.0L (2,998cc)
Power Output Range340-375hp across the variant's historyEngine History Timeline
B58B30C 3.0L turbocharged petrol, 340hp - launch engine for G05 X5 xDrive40i
B58B30M1 3.0L turbocharged petrol, 340hp - updated engine calibration with revised emissions compliance
Mild hybrid (48V) system introduced across B58B30M1 adding electric torque assistance and improved fuel economy
B58B30P 3.0L turbocharged petrol with 48V mild hybrid, 375hp - G05 LCI facelift power increase
xDrive50e PHEV launched alongside but 40i remains the core petrol entry model
Key Specs Snapshot
Fuel TypePetrol (with 48V mild hybrid from 2022)Engine Size3.0L (2,998cc)Power Output Range340-375hp across the variant's historyTorque450-540NmYears Produced2018-presentEvery engine fitted to the BMW X5 40i is covered below, with UK rebuilt pricing and known failure points for the B58B30 family.
BMW X5 40i Engine Codes - Specifications & Replacement CostBMW X5 40i Engine Codes - Specifications & Replacement Cost
3.0L Petrol (2018-2020)
Power Output340hp (250kW) @ 5,500-6,500rpmTorque450NmYears Fitted2018-2020
Compatible Trim Levels
- xDrive40i
- xDrive40i M Sport
- xDrive40i xLine
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£2,000-£3,500
Reconditioned
Addressed known issues, tested
£3,200-£5,000
Rebuilt
Full teardown, upgraded internals
£3,800-£6,800
Common Failure
The B58B30C is the earliest G05 40i variant. Coolant leaks from the expansion tank and water pump are the most commonly reported issues, typically appearing between 30,000-60,000 miles. The plastic coolant expansion tank can develop hairline cracks under thermal cycling. [THIRD-PARTY - BMW specialist consensus]
The BMW X5 40i is powered exclusively by the B58B30 family - a 3.0-litre turbocharged straight-six petrol engine widely regarded as one of BMW's most reliable modern powerplants. The B58 features a closed-deck engine block design, which significantly improves strength and durability compared to its N55 predecessor. While the B58 is a robust engine, it has several well-documented minor failure points that become more common as mileage climbs past 60,000 miles. Rebuilt B58 engines supplied through EnginesMarket include upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the BMW X5 40i Loses Coolant and Overheats
Affected Vehicles
BMW X5 40i (B58B30C / B58B30M1 / B58B30P, 2018-present)
Typical Failure Mileage
30,000-60,000 miles
Root Cause
The B58 engine uses a plastic coolant expansion tank and integrated supply lines that can develop hairline cracks under thermal cycling. The water pump and thermostat housing are also common leak points. Coolant loss, if ignored, can lead to overheating and potential head gasket failure.
Why It Happens
The B58 engine uses a plastic coolant expansion tank and integrated supply lines that can develop hairline cracks under thermal cycling. The water pump and thermostat housing are also common leak points. Coolant loss, if ignored, can lead to overheating and potential head gasket failure.
Dealer (parts + labour)
£500-£800
Specialist (parts + labour)
£300-£500
What it involves
Replace coolant expansion tank and supply line, bleed cooling system
Suitability
30,000-60,000 miles. Viable if low coolant warning appears but no overheating.
1 - 2 daysDealer (parts + labour)
£800-£1,200
Specialist (parts + labour)
£500-£800
What it involves
Replace electric water pump, thermostat, and coolant
Suitability
60,000-80,000 miles. Recommended preventatively on B58 engines.
1 - 2 daysDealer (parts + labour)
£7,000-£10,000
Specialist (parts + labour)
£4,500-£7,500
What it involves
Supply & fit rebuilt B58 engine with updated cooling components, 12-month warranty
Suitability
Required if overheating caused head gasket or block damage (rare on B58).
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Minor - Expansion tank replacement Minor | £500-£800 | £300-£500 | Replace coolant expansion tank and supply line, bleed cooling system | 30,000-60,000 miles. Viable if low coolant warning appears but no overheating. | 1 - 2 days |
 Intermediate - Water pump + thermostat replacement Best Value | £800-£1,200 | £500-£800 | Replace electric water pump, thermostat, and coolant | 60,000-80,000 miles. Recommended preventatively on B58 engines. | 1 - 2 days |
Full Replacement - rebuilt/reconditioned engine Best Value | £7,000-£10,000 | £4,500-£7,500 | Supply & fit rebuilt B58 engine with updated cooling components, 12-month warranty | Required if overheating caused head gasket or block damage (rare on B58). | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2019-2024 BMW X5 40i is valued at approximately £18,000-£45,000 in the UK market. With a rebuilt B58 engine costing £3,800-£6,800 supply-only (plus £800-£1,200 fitting), replacement cost represents 10-20% of vehicle value on most examples - making full replacement highly viable for all but the oldest, highest-mileage examples.
Our Recommendation
Our Recommendation
The B58's coolant system is the primary weak point, but it rarely causes catastrophic failure if addressed promptly. For under £500 at a specialist, expansion tank replacement is cheap insurance. On any X5 40i approaching 60,000 miles, consider preventative water pump replacement. The B58 is BMW's most reliable modern petrol engine - full replacement is rarely needed unless the engine has been driven after overheating.
Don't Let Engine Failure Write Off Your BMW X5 40i
The B58-powered BMW X5 40i is widely considered the most reliable modern petrol X5 variant ever built. The closed-deck engine block and proven architecture mean catastrophic failure is rare - but coolant system components, gaskets, and the HPFP are wear items that need attention as mileage accumulates. EnginesMarket connects you with trusted UK BMW specialists who supply rebuilt B58 engines with upgraded components specifically designed to address the original failure points. Every engine comes with a minimum 12-month unlimited-mileage warranty, nationwide delivery, and supply & fit options across the UK. Compare prices today - and keep your 40i on the road without paying main dealer prices.
Compare rebuilt B58 BMW X5 40i engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW X5 40i. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW X5 40i Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW X5 40i engine replacement cost in the UK-
A full BMW X5 40i engine replacement typically costs £3,800-£6,800 supply-only for a rebuilt B58 unit, or £4,500-£7,500 fitted by a specialist. Used engines start from £2,000, while reconditioned units typically cost £3,200-£5,000.
- Prices vary by exact B58 variant (B58B30C / B58B30M1 / B58B30P)
- Professional fitting adds £800-£1,200 to any engine purchase
- Rebuilt units include upgraded cooling and gasket components
- 12-month unlimited-mileage warranty on all rebuilt engines
Question 2Is the BMW X5 40i reliable- How long does the B58 engine last-
The B58 is widely considered BMW's most reliable modern petrol engine. The closed-deck design and proven architecture mean B58 engines regularly exceed 150,000-200,000 miles with proper maintenance.
- Annual oil changes (not BMW's extended intervals) are critical
- Coolant system components (expansion tank, water pump) are the main wear items
- B58 is significantly more reliable than the N55 it replaced
- Many specialists report B58s reaching 200,000+ miles with preventative maintenance
Question 3What are the common problems with the BMW X5 40i B58 engine-
The B58B30 family has three well-documented failure points: coolant system leaks (expansion tank, water pump), oil filter housing gasket leaks (burning oil smell), and high-pressure fuel pump (HPFP) failure. All three typically appear between 30,000-100,000 miles.
- Coolant expansion tank replacement at specialist: £300-£500
- Water pump replacement at specialist: £500-£800
- Oil filter housing gasket at specialist: £300-£500
- HPFP replacement at specialist: £800-£1,200
- Catch issues early to avoid full engine replacement
Question 4Is it worth replacing the engine on a BMW X5 40i-
For a 2019-2024 X5 40i worth £18,000-£45,000, a £3,800-£6,800 rebuilt B58 engine represents excellent value - typically 10-20% of the vehicle's value. The decision depends on the individual car's condition and your ownership horizon.
- Replacement cost is small relative to vehicle value on most examples
- If body and gearbox are sound, a rebuilt engine adds years of life
- Used engine (£2,000-£3,500) is the budget option
- Rebuilt engine (£3,800-£6,800) offers warranty and peace of mind
- B58 engines rarely need full replacement - repairs usually suffice
Question 5What's the difference between the BMW X5 40i and the xDrive40i-
The 40i badge refers to the engine - the B58 3.0-litre turbocharged petrol straight-six. xDrive is BMW's all-wheel-drive system. In the UK, all X5 40i models are xDrive (all-wheel drive). In North America, a rear-wheel-drive sDrive40i variant was also available.
- 40i = engine designation (B58 3.0L turbo petrol)
- xDrive = all-wheel drive (UK market standard)
- sDrive = rear-wheel drive (North America only)
- All UK X5 40i models are xDrive40i
Question 6Can I replace my BMW X5 40i engine with a different size or fuel type-
Engine swaps to a different size or fuel type are technically complex and rarely cost-effective on the G05 X5. Stick to like-for-like replacement using the correct B58 engine code (B58B30C, B58B30M1, or B58B30P) for your X5 40i.
- ECU, wiring loom, fuel system, and exhaust all differ between petrol and diesel
- Mild hybrid (48V) components are engine-specific
- Insurance must be notified of any non-standard engine swap
- Specialist marketplace only recommends like-for-like code-matching
Why Choose UsCompare BMW X5 40iEngine PricesToday
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12-Month Warranty on every rebuilt BMW X5 40i engine
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