BMW 4 Series M440i Engine ReplacementCompare Prices & Get Quotes

A BMW 4 Series M440i engine replacement typically costs between £3,800 and £6,000 for a reconditioned unit, with rebuilt engines ranging from £5,000 to £8,000. Used engines start from around £2,000. These prices are supply-only - fitting adds 12-16 hours of labour at specialist rates (£780-£1,040) due to the complexity of the B58 engine.

• Reconditioned B58B30O1/O2: £3,800-£6,000
• Rebuilt B58B30O1/O2: £5,000-£8,000
• Used B58B30O1/O2: £2,000-£4,000

The B58 engine in the M440i is generally reliable, but there are some well-documented issues to be aware of. The most common are cooling system leaks (plastic vent hoses, water pump seals), oil filter housing and valve cover gasket leaks, and VANOS solenoid failure.

• Cooling leaks: plastic components crack; regular inspection is essential
• Oil leaks: valve cover and oil filter housing gaskets degrade over time
• VANOS solenoid: O-ring failure can cause rough idle and power loss

For a BMW 4 Series M440i valued at £30,000-£60,000 `[THIRD-PARTY]`, a rebuilt engine at £5,000-£8,000 is typically worthwhile if the car is otherwise in good condition. This represents approximately 10-20% of the vehicle's value.

• Cars worth £30,000-£40,000: reconditioned engine is a viable option
• Cars worth £40,000+: rebuilt engine with warranty is usually the best long-term value
• Always factor in the car's overall condition - not just the engine

All UK-market BMW 4 Series M440i models are xDrive (all-wheel drive) as standard. The M440i xDrive features BMW's intelligent all-wheel-drive system with rear-biased torque distribution, providing enhanced traction and handling. The engine is identical - the B58B30O1 or B58B30O2 3.0-litre turbocharged inline-six producing 374bhp.

• All UK M440i models are xDrive
• 0-62mph: 4.7 seconds (Coupe)
• xDrive adds approximately 1-2 hours to engine fitting labour

A BMW 4 Series M440i engine replacement typically takes 2-4 days for a specialist workshop to complete, assuming the replacement engine is already in stock. The B58's complexity and rear-mounted timing chain design mean the job requires more time than a 4-cylinder engine.

• Supply only: 1-2 days for delivery
• Supply & fit: 3-4 days in the workshop
• Some specialists offer same-day dispatch on qualifying orders

Every rebuilt and reconditioned engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty. Some suppliers offer extended warranties of up to 24 months on certain engine types. Always confirm exact terms with your chosen supplier before purchase.

• 12-month unlimited-mileage: minimum standard
• 24-month options: available on many premium rebuilds
• Warranty covers: manufacturing defects and component failure

The BMW 4 Series M440i with the B58 engine is widely regarded as one of BMW's most reliable modern performance engines. The B58 has earned a reputation for robustness and tuning potential, often compared to the legendary 2JZ. However, like any high-performance engine, it requires diligent maintenance - particularly regular oil changes and cooling system inspections.

• B58 is significantly more reliable than the N54 and N55
• Regular oil changes (8,000-10,000 miles) are critical
• Cooling system components should be inspected regularly
• Some early B58TU2 (2024) models have faced rocker arm recalls