BMW 7 Series 740d Engine Replacement Compare Prices & Get Quotes

A BMW 7 Series 740d engine replacement typically costs £2,500-£4,500 for a used N57 or B57 unit, £3,800-£5,500 for a reconditioned engine, and £4,500-£7,000+ for a fully rebuilt engine with 12-month warranty. Supply and fit costs add approximately £800-£1,200 depending on your location and the specialist's labour rates. The 740d's B57 engine is generally more expensive to replace than the N57 due to its newer technology and mild-hybrid components.

• Used engines: lowest cost, variable mileage and condition
• Reconditioned engines: mid-range, with replaced wearing components
• Rebuilt engines: highest cost, fully stripped and restored to OE spec
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The most common signs of N57 or B57 engine trouble in a 740d include: rattling noise from the engine bay at startup (timing chain stretch on N57 engines), loss of power and warning lights (DPF/EGR blockage), whistling noise during acceleration (turbocharger failure), oil spots under the car (valve cover or oil filter housing leaks), and increased fuel consumption.

• Timing chain issues: rattling on startup, rough idle (N57)
• DPF/EGR issues: loss of power, poor fuel economy, warning lights
• Turbo issues: whistling noise, power loss, engine light
• Oil leaks: visible oil spots, burning oil smell
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Yes - if your BMW 7 Series 740d is otherwise in good condition, a replacement engine can extend its life significantly and retain strong value. With a typical 2016-2019 740d G11 valued at £15,000-£28,000, a rebuilt engine at £4,500-£7,000 plus fitting represents a sound investment for well-maintained examples. The B57 engine in the 740d is generally more reliable than the N57, but replacement costs reflect this premium.

• Vehicle worth £15,000+: rebuilt engine is cost-effective
• Vehicle worth £8,000-£15,000: reconditioned is viable if keeping the car 2+ years
• Vehicle worth under £8,000: used engine or scrappage may be more sensible
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Most BMW 7 Series 740d engine replacements take 2-4 days for supply and fit at a specialist garage. Collection and delivery options are available nationwide, with most engines dispatched within 24-72 hours of order confirmation. The B57's more complex engine management and mild-hybrid systems may require additional time for calibration compared to the simpler N57.

• Supply only: 24-72 hours dispatch
• Supply and fit: 2-4 days at specialist garage
• Nationwide collection/delivery available
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Yes - all rebuilt BMW 7 Series 740d engines supplied through EnginesMarket include a minimum 12-month unlimited-mileage warranty. Used engines typically come with a 3-6 month warranty depending on the supplier, and reconditioned engines often carry a 12-24 month warranty. Always confirm the exact warranty terms with your chosen supplier before purchasing.

• Rebuilt engines: 12+ months unlimited mileage
• Reconditioned engines: 12-24 months
• Used engines: 3-6 months typically
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The N57 (2008-2015) is BMW's previous-generation 3.0-litre diesel, available in twin-turbo configuration in the 740d. The B57 (2015-present) is BMW's modular replacement, featuring an aluminium alloy block, improved timing chain durability, and advanced emissions technology. B57 engines are generally more reliable and fuel-efficient, but both share common diesel-related issues like DPF and EGR clogging. The B57 also offers mild-hybrid options from 2020 onwards.

• N57: older, timing chain issues more common, 306hp
• B57: newer, improved timing chain durability, 320-340hp
• Both: 3.0L, six-cylinder, 2,993cc displacement