BMW 5 Series 518d Engine ReplacementCompare Prices & Get Quotes

A BMW 5 Series 518d engine replacement typically costs between £1,500 and £5,800 for the engine itself, depending on condition. Used engines start from around £1,200-£1,500, while reconditioned and rebuilt units range from £2,800 to £5,800. Supply and fitting adds approximately £650-£910 in labour for an indie specialist, or more at a main dealer.

• Used engine: £1,200-£2,800 supply only
• Reconditioned: £2,800-£4,800 supply only
• Rebuilt: £3,800-£5,800 supply only
• Fitting labour: £650-£910 at indie rates

The most common warning sign is a rattling or metallic noise from the engine on cold start, lasting a few seconds. Other symptoms include rough idling, reduced performance, and engine warning lights. If the chain snaps, the engine will fail catastrophically - valves and pistons can collide, requiring a full engine replacement.

• Cold-start rattle is the earliest and most important warning
• Don't ignore it - investigate immediately
• N47-powered 518d models (2013-2014) are most at risk

It depends on the vehicle's value and the extent of the damage. For an F10-generation 518d worth £4,000-£8,000, a full rebuilt engine at £3,800-£5,800 may represent 50-80% of the car's value - a used engine or repair may be more sensible. For a G30-generation 518d worth £12,000-£25,000, a rebuilt engine is a financially sound investment.

• Assess your car's current market value first
• Rebuilt engines come with 12-month warranty and upgraded components
• Compare quotes before deciding

A full BMW 5 Series 518d engine replacement typically takes between 5 and 10 working days, depending on the internal condition found during stripdown and parts availability. Supply-only options can be dispatched within 1-2 working days, with fitting then scheduled at your chosen specialist.

• Supply only: 1-2 days for dispatch
• Full replacement including fit: 5-10 working days
• Timing chain replacement: 2-3 days at a specialist

Both the 518d and 520d use the same 2.0-litre four-cylinder diesel engine family (N47 or B47), but with different power outputs. The 518d produces 143-150bhp, while the 520d produces 184-190bhp. The engines are physically similar, but the 520d uses a different turbocharger and engine calibration to achieve higher power.

• 518d: 143-150bhp, entry-level diesel
• 520d: 184-190bhp, higher-output version
• Same engine family - many components are interchangeable

While both engines are 2.0-litre diesels and share the same mounting points, an N47-to-B47 swap is not a straightforward bolt-in replacement. The B47 uses different engine management, wiring looms, sensors, and emissions systems (including AdBlue on later models). A full conversion requires extensive electrical work and is rarely cost-effective compared to fitting the correct engine for your chassis.

• B47 is not a direct swap for N47
• Different ECU, wiring, and emissions hardware
• Fitting the correct engine for your year is the most reliable option