BMW X5 40i Engine Replacement Compare Prices & Get Quotes

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

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

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

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

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

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