BMW 6 Series 620d Engine Replacement Compare Prices & Get Quotes

A BMW 6 Series 620d engine replacement typically costs £1,500-£2,800 for a used B47D20 unit, £2,800-£4,500 for a reconditioned engine, and £3,800-£5,800 for a fully rebuilt engine with warranty. Supply & fit adds £520-£780 in specialist labour (8-12 hours).

• Used engines: lowest upfront cost, limited warranty
• Reconditioned: mid-range, some new parts fitted
• Rebuilt: highest cost, fully restored to factory spec with 12-month warranty

Common symptoms include coolant loss without visible external leaks, increased exhaust smoke, decreased fuel efficiency, and EGR-related fault codes. In advanced cases, the engine may overheat or show a coolant warning light. If you suspect EGR cooler failure, have it inspected immediately - internal coolant leaks can cause serious engine damage.

• Coolant loss: first warning sign
• Increased exhaust smoke: coolant entering exhaust
• Reduced fuel economy: EGR system compromised

With average values of £16,000-£20,000, a full rebuilt engine at £3,800-£5,800 represents 20-35% of the vehicle's value - making replacement financially viable for most examples. If your 620d is in good condition with reasonable mileage, a rebuilt engine can extend its life by 150,000+ miles.

• Sub-£15,000 car: consider a used engine or targeted repair
• £15,000-£20,000 car: reconditioned engine is viable
• £20,000+ car: rebuilt engine with warranty makes strong financial sense

A typical BMW 6 Series 620d engine replacement takes 2-4 days for supply and fit at a specialist garage. The B47D20 is a four-cylinder unit with reasonable engine bay access, but the G32's complex electronics and xDrive variants add labour time. Most specialists offer collection/delivery options nationwide.

• Same-day dispatch available for in-stock engines
• Fitting typically completed within 3 working days
• Collection/delivery options available across the UK

The 620d uses the 2.0L B47D20 four-cylinder diesel (190hp, 400Nm), while the 630d uses the 3.0L B57D30 six-cylinder diesel (261hp, 620Nm). The 620d offers better fuel economy (up to 58.9mpg) and lower running costs, but the 630d delivers significantly more torque and a smoother, more refined driving experience.

• 620d: 2.0L four-cylinder, 190hp, 400Nm torque
• 630d: 3.0L six-cylinder, 261hp, 620Nm torque
• 620d replacement cost: £1,500-£5,800 vs 630d: higher

The B47D20 is considered significantly more reliable than the older N47 diesel. BMW relocated the timing chain to the front of the engine, addressing the N47's notorious chain failure issue. However, EGR cooler failure and DPF clogging remain common concerns, particularly on vehicles used mainly for short urban journeys.

• Timing chain: far less prone to failure than N47
• Regular motorway driving: essential for DPF health
• EGR cooler inspection: recommended every 60,000 miles