BMW 6 Series 640i Engine ReplacementCompare Prices & Get Quotes

A BMW 6 Series 640i engine replacement typically costs £2,300-£3,500 for a used N55 unit, £3,500-£4,500 for a reconditioned engine, and £4,820-£5,500 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.

• 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 N55 engine trouble in a 640i include: long cranking times or difficulty starting (often HPFP-related), rattling noise from the engine bay at startup (timing chain stretch), engine misfires or loss of power, excessive oil consumption or visible oil leaks from the valve cover or oil filter housing, and the check engine light illuminating.

• HPFP failure: long crank, misfires, stalling
• Timing chain issues: rattling on startup, rough idle
• Oil leaks: visible oil spots, burning oil smell
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Yes - if your BMW 6 Series 640i is otherwise in good condition, a replacement engine can extend its life by 80,000+ miles and retain strong value. With a typical 2014-2016 640i valued at £13,000-£22,000, a rebuilt engine at £4,820-£5,500 plus fitting represents a sound investment compared to the £8,000-£10,000 main dealer alternative.

• Vehicle worth £13,000+: rebuilt engine is cost-effective
• Vehicle worth £8,000-£13,000: reconditioned is viable if keeping the car 2+ years
• Vehicle worth under £8,000: used engine typically makes more sense
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Most BMW 6 Series 640i engine replacements take 1-3 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 exact turnaround depends on the condition type chosen (used engines are typically faster to source; rebuilt units may have longer lead times for the rebuild process).

• Supply only: 24-72 hours dispatch
• Supply and fit: 1-3 days at specialist garage
• Nationwide collection/delivery available
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Yes - all rebuilt BMW 6 Series 640i 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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Yes - specialist suppliers can offer upgraded N55 variants with calibrated ECU maps for rebuilt engines. Upgrades may include enhanced timing chain components, updated PCV systems to address oil separator failures, and improved cooling system components. Contact specialists directly for performance upgrade options and pricing.

• Enhanced timing chain components available
• Updated PCV system for oil separator reliability
• Improved cooling system for track/performance use