BMW 4 Series 440i Engine ReplacementCompare Prices & Get Quotes

A BMW 4 Series 440i engine replacement typically costs £2,000-£3,800 for a used unit, £3,800-£6,000 for a reconditioned engine, and £4,500-£7,000 for a fully rebuilt B58B30M0 with warranty. Supply-only prices exclude fitting - budget an additional £700-£1,100 for specialist labour.

• Used engine: cheapest option, variable mileage and condition
• Reconditioned: tested and restored to good working order
• Rebuilt: fully stripped, inspected, and built to factory specification with upgraded components

Yes - the B58 is widely regarded as one of the most reliable modern BMW engines. It has few catastrophic failure modes and is known for its robust construction, strong tuning potential, and longevity. However, it does have known maintenance items including coolant leaks, oil filter housing gasket leaks, and PCV diaphragm failure.

• B58 is considered BMW's most reliable modern engine
• Regular maintenance is key to longevity
• Most issues are repairable and not catastrophic

The most common signs of B58 issues include: coolant loss (check the reservoir regularly), oil leaks around the valve cover or oil filter housing, whistling sounds from the engine (PCV diaphragm failure), rough idle or power loss (VANOS solenoid issues), and blue or white smoke from the exhaust.

• Regularly check coolant and oil levels
• Listen for unusual whistling or rattling noises
• Address check engine lights promptly

With a typical 440i valued at £12,000-£28,000, a rebuilt engine at £4,500-£7,000 represents a significant but justifiable investment - especially if the car is otherwise in good condition. The B58 is a desirable engine, and the 440i is a car that retains value well. For most owners, replacement makes financial sense.

• Vehicle worth over £15,000: replacement usually makes financial sense
• Vehicle worth under £12,000: evaluate carefully; repair may be better value
• Always get a specialist diagnosis before deciding

A typical BMW 4 Series 440i engine replacement takes 1-2 days for a specialist workshop, assuming the replacement engine is already available. The B58 is a well-understood engine with good parts availability, though the inline-six configuration requires careful installation.

• Supply: 1-2 days for delivery from stock
• Fitting: 10-14 hours of workshop time
• Allow 2-3 days total for a supply-and-fit service

The BMW 440i (F32/F33/F36, 2016-2020) uses the B58B30M0 engine producing 326hp. The M440i (G22/G23/G26, 2020-present) uses the newer B58B30B engine producing 374hp (or 387hp with the MHT mild-hybrid system in later models). The M440i also features a more aggressive chassis setup, M Sport differential, and cosmetic upgrades - but both share the same fundamental B58 engine architecture.

• 440i: B58B30M0, 326hp, produced 2016-2020
• M440i: B58B30B, 374-387hp, produced 2020 onwards
• Engine codes are not interchangeable - always match the correct code

Yes - every rebuilt and reconditioned BMW 4 Series 440i engine supplied through EnginesMarket comes with a minimum 12-month unlimited-mileage warranty. Used engines typically carry a shorter warranty (30-90 days), so always confirm the terms with your chosen supplier.

• Rebuilt/reconditioned: 12-month warranty minimum
• Used: typically 30-90 days depending on supplier
• Always request warranty terms in writing before purchase