A complete 2025 UK cost reference for BMW engine replacements – used, reconditioned and rebuilt prices for every popular engine, plus labour hours and request volumes to help you compare.
The short answer: BMW engine replacement costs in the UK vary widely by engine code. The N47D20C is the most requested (1,450 enquiries in 2025 [EM‑VERIFIED]) and costs £3,200–£5,500 reconditioned supply, while the S63B44 V8 can reach £9,000–£14,000 supply [EM‑QUOTE]. Labour adds 10–24 hours at indie rates (£65–£90/hr). Always factor in your car's value – the 70% rule often determines whether a repair is worth it.
Next step: Use the table below to find your engine, then apply the 70% rule with our Repair vs Replace Calculator.
All figures are supply‑only (excluding fitting). Used engines are the cheapest but riskiest; reconditioned offers a balance; rebuilt is highest quality. Labour is additional – see the labour hours column for guidance.
| Engine Code | 2025 Requests | Used (Supply) | Reconditioned (Supply) | Rebuilt (Supply) | Labour Hours |
|---|---|---|---|---|---|
| N47D20C | 1,450 [EM‑VERIFIED] | £1,800–£3,200 [EM‑QUOTE] | £3,200–£5,500 | £4,500–£6,500 | 10–14 hrs |
| B47D20A | 930 [EM‑VERIFIED] | £1,500–£2,800 | £2,800–£4,500 | £3,800–£5,800 | 8–12 hrs |
| N57D30 | 830 [EM‑VERIFIED] | £2,500–£4,500 | £4,500–£7,000 | £6,000–£9,000 | 12–16 hrs |
| B58B30 | 540 [EM‑VERIFIED] | £2,000–£3,800 | £3,800–£6,000 | £5,000–£8,000 | 10–14 hrs |
| B57D30 | 460 [EM‑VERIFIED] | £2,800–£5,000 | £5,000–£8,000 | £7,000–£10,500 | 12–16 hrs |
| N63B44 | 440 [EM‑VERIFIED] | £3,500–£6,000 | £6,000–£10,000 | £8,000–£14,000 | 16–22 hrs |
| S63B44 | 410 [EM‑VERIFIED] | £5,000–£9,000 | £9,000–£14,000 | £12,000–£18,000 | 18–24 hrs |
| M57D30 | (included in N57 data – older variant) | 12–16 hrs | |||
All costs are supply‑only; fitted costs are higher by the labour hours shown, at indie rates of £65–£90/hr (main dealer +40–60%). Used engines typically carry limited warranty; reconditioned and rebuilt units come with 12‑24 months. For the full 62‑engine list, see our 2026 cost data page.
These costs are a starting point. The final price depends on your chosen supplier, your car's platform, and the condition of the engine.
All figures are for the engine alone. Labour adds £650–£2,160 depending on hours and rate. Always ask for a supply‑and‑fit quote to get the full picture.
Used – cheapest, but unknown history. Reconditioned – stripped, cleaned, worn parts replaced – the most popular option (70% of our enquiries). Rebuilt – full rebuild with new pistons, bearings, etc. – closest to new.
Reconditioned and rebuilt engines usually include a 12‑24 month warranty. Used engines may come with 30 days or none. Always verify the warranty terms before purchase.
For a deeper comparison of engine conditions, see our Reconditioned vs Used vs Rebuilt guide. For labour rates, visit Labour Rates & Fitting Times.
The replacement cost is only half the decision. The other half is your car's current market value. We use a 70% repair‑to‑value threshold – if the fitted cost exceeds 70% of your car's value, the honest verdict is usually to scrap it.
Let's apply it to a few common scenarios using real costs from the table above.
Reconditioned supply: £4,500 (mid-range). Labour: 12 hrs × £75 = £900. Total fitted: £5,400.
Ratio: £5,400 ÷ £7,500 = 72% – ⚠️ Watch (slightly over 70%)
If the car were worth £8,500, the ratio drops to 64% – ✅ Safe.
Reconditioned supply: £5,750. Labour: 14 hrs × £80 = £1,120. Total fitted: £6,870.
Ratio: £6,870 ÷ £9,000 = 76% – 🔴 Scrap (over 70%)
At £11,000 value, ratio = 62% – ✅ Safe.
Reconditioned supply: £4,900. Labour: 12 hrs × £75 = £900. Total fitted: £5,800.
Ratio: £5,800 ÷ £20,000 = 29% – ✅ Safe
Always check your car's current trade value (e.g., Auto Trader, Parkers) and get a firm supply‑and‑fit quote. Our calculator can do this for you.
Unsurprisingly, the V8s – S63 and N63 – are the most expensive to replace, often exceeding £10,000 supply. The 4‑cylinder N47 is the most requested and one of the cheapest to replace, but its popularity is driven by high failure rates, not low cost.
For a full picture of repair costs across all models, see our Average Replacement Cost by Model page.
Having a cost table is useful, but the decision isn't just about the price. Here are the scenarios where the honest answer is "no".
E90 320d with N47 chain failure: replacement cost often exceeds 70% of the car's value. Unless the car is in exceptional condition, scrap it.
An E70 X5 with N63 failure: the repair cost can be £8,000+ on a car worth £5,000. That's over 160% – clearly not worth it.
Below this line, even a cheap N47 reconditioned engine (£3,200) plus fitting (£900) gives a ratio of ~100% – never worthwhile. Sell it for parts.
For a deeper dive, read our When Should You Scrap a BMW? guide.
The N47D20C is the most affordable reconditioned unit at £3,200–£5,500 supply, but its high failure rate makes it a common replacement. The B47 is slightly cheaper and more reliable.
The S63 is a high‑performance twin‑turbo V8 with complex hot‑vee architecture, expensive internals, and low production volumes – all of which drive up the cost of replacement.
These are typical independent specialist supply prices. Main dealers typically add 30‑50% to supply costs and charge higher labour rates.
Labour ranges from 10–24 hours. At indie rates of £65–£90/hr, fitting adds £650–£2,160. Main dealer labour adds 40‑60% more.
Use our registration lookup to get fixed‑price quotes from vetted specialists, or try the calculator to estimate total costs.
Genuine Enquiry DataBuilt from 9,000+ real 2025 UK BMW engine enquiries, not estimates.
Fully Disclosed MethodThe only BMW engine site that publishes its scrap‑threshold methodology openly.
20+ Vetted BMW SpecialistsEvery recommendation routes to a specialist who works on these engines daily.
100% IndependentNo sponsors, no manufacturer influence — including when the honest answer is "don't repair it."
Use our calculator to estimate total costs, or connect directly with a vetted specialist for a fixed‑price quote.
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