What does it actually cost to replace a Mercedes engine? Reconditioned units from £2,800 for an OM651 to over £14,000 for an M177 AMG V8 — plus labour. Here’s the full breakdown.
In our 2025 UK data, the average supply‑only cost of a reconditioned Mercedes engine ranges from £2,800 (OM651 2.1 diesel) to £14,000 (M177 AMG V8). With independent labour (8–24 hours at £65/hr), a fitted cost is typically £3,500–£15,500. Used engines are cheaper (from £1,500), but reconditioned units represent 70% of all requests and offer the best balance of reliability and cost.
Full methodology and engine‑by‑engine data below.
How we gather and present replacement cost data.
Source: Internal CRM quote‑request data from EnginesMarket.co.uk and EngineFinders.co.uk, combined. Full year 2025. Over 4,500 unique Mercedes engine enquiries, with detailed cost data drawn from supplier quotes sent through our platform.
What costs are included: Supply‑only prices for used, reconditioned, and rebuilt engines, sourced from actual quotes sent to customers. Labour hours are estimated based on specialist workshop interviews and cross‑checked with industry guides. The fitted cost is supply price + labour (at £65/hr indie rate, excluding VAT). Main dealer costs are typically 30–50% higher.
Limitations: Our data reflects prices quoted in 2025 – they may have changed. Costs vary by engine variant, vehicle application, and regional labour rates. We present the typical ranges, not a fixed price. Always obtain a current quote for your specific vehicle.
Refresh cycle: Annually, each February. This is our first edition, establishing the baseline for future year‑on‑year comparisons.
The key cost takeaways from our Mercedes data.
All prices [EM-QUOTE] from 2025 supplier quotes.
Reconditioned engines are the overwhelming choice for Mercedes owners, accounting for 70% of all enquiries. The average supply‑only cost across all Mercedes engines in our dataset is approximately £4,500, but this varies dramatically: an OM651 2.1 diesel can be had for under £3,000, while an M177 AMG V8 costs over £10,000. Labour adds another £520–£1,560, depending on engine complexity and access.
The most cost‑effective option for older or lower‑value vehicles is often a used engine – but these carry more risk. Our data shows that reconditioned units, while pricier upfront, have a significantly lower post‑installation failure rate, according to our post‑sale surveys [EM-SURVEY].
Every major Mercedes engine with supply‑only and fitted cost ranges.
| Engine Code | 2025 Enquiries | Used (Supply) | Reconditioned (Supply) | Rebuilt (Supply) | R&R Labour Hours | Fitted Cost (Indie) |
|---|---|---|---|---|---|---|
| OM651 | 1,250 [EM-VERIFIED] | £1,500–£2,800 [EM-QUOTE] | £2,800–£4,800 [EM-QUOTE] | £4,000–£6,000 [EM-QUOTE] | 8–12 hrs | £3,500–£5,500 |
| OM642 | 880 [EM-VERIFIED] | £1,800–£3,200 [EM-QUOTE] | £3,200–£5,500 [EM-QUOTE] | £4,500–£7,000 [EM-QUOTE] | 10–14 hrs | £4,000–£6,500 |
| OM654 | 520 [EM-VERIFIED] | £1,800–£3,200 [EM-QUOTE] | £3,000–£5,000 [EM-QUOTE] | £4,200–£6,500 [EM-QUOTE] | 8–12 hrs | £3,700–£5,800 |
| M276 | 390 [EM-VERIFIED] | £2,000–£3,800 [EM-QUOTE] | £3,800–£6,500 [EM-QUOTE] | £5,500–£8,500 [EM-QUOTE] | 12–16 hrs | £4,800–£7,800 |
| M272 | 390 [EM-VERIFIED] | £2,000–£3,800 [EM-QUOTE] | £3,800–£6,500 [EM-QUOTE] | £5,500–£8,500 [EM-QUOTE] | 12–16 hrs | £4,800–£7,800 |
| OM656 | — [ESTIMATED] | £2,800–£5,000 [EM-QUOTE] | £5,000–£8,000 [EM-QUOTE] | £7,000–£10,500 [EM-QUOTE] | 12–16 hrs | £6,000–£9,500 |
| M177 | 370 [EM-VERIFIED] | £4,000–£8,000 [EM-QUOTE] | £8,000–£14,000 [EM-QUOTE] | £12,000–£18,000 [EM-QUOTE] | 16–22 hrs | £9,000–£15,500 |
| M274 | — [ESTIMATED] | £1,500–£2,800 [EM-QUOTE] | £3,000–£5,000 [EM-QUOTE] | £4,200–£6,500 [EM-QUOTE] | 8–12 hrs | £3,700–£5,800 |
All enquiry figures [EM-VERIFIED] from 2025 CRM. Pricing [EM-QUOTE] from supplier quotes. Labour hours and fitted costs are estimates – see our Labour Rates & Fitting Times guide for more detail.
This is our first edition – establishing the baseline for future comparisons.
As this is the first year of publication, we don’t yet have historical data to compare against. However, we have built a robust methodology that will allow us to track cost trends over time – for example, whether reconditioned OM651 prices are rising due to parts scarcity, or whether newer engines like the OM654 are becoming cheaper as more units enter the used market.
We will update this report annually, each February, and publish year‑on‑year changes in future editions. This baseline will also help us identify which engines are becoming more or less expensive to replace, which can inform buying decisions.
How to use cost data when facing an engine failure.
The biggest decision you’ll face is whether to repair, replace, or scrap. Our 70% framework is a good starting point: if the fitted replacement cost exceeds 70% of your vehicle’s current market value, scrapping may be the better financial choice. For example, a £4,500 fitted OM651 in a £7,000 W204 C‑Class is borderline; a £6,000 fitted OM642 in a £5,000 W211 E‑Class is likely a write‑off.
If you decide to replace, the table above gives you a realistic budget. Always get a quote from multiple specialists – prices can vary significantly. And consider the long‑term reliability: reconditioned engines cost more upfront but often come with a 12‑month warranty and are less likely to fail again soon. Used engines are cheaper but carry more risk.
For detailed guidance on each option, see our Reconditioned vs Used vs Rebuilt guide. And if you're unsure about the decision, try our Repair vs Replace Calculator – it uses real data to help you decide.
Feel free to reference this cost data in articles, forum discussions, or your own research. Suggested attribution:
For press enquiries or the full underlying dataset, contact us via our About page.
Across all Mercedes engines in our 2025 dataset, the average supply‑only cost is approximately £4,500. However, this ranges from £2,800 for an OM651 to over £14,000 for an M177 AMG V8. The fitted cost (including indie labour) typically adds £520–£1,560, depending on engine complexity [EM-QUOTE].
Used engines are cheaper – around £1,500–£3,200 for common diesels – but they carry more risk. Reconditioned engines are stripped, inspected, and rebuilt to factory specs, and they usually come with a warranty. In our data, 70% of customers choose reconditioned over used, citing long‑term reliability [EM-SURVEY].
Independent specialists typically charge £65–£80 per hour in the UK (excluding London premiums). Labour hours range from 8–12 hours for a 4‑cylinder diesel (OM651) to 16–22 hours for an AMG V8 (M177). Fitted labour cost is therefore around £520–£1,560. Main dealer rates are 30–50% higher [EM-QUOTE].
Our 70% framework is a useful guide: if the fitted replacement cost exceeds 70% of the vehicle’s current market value, scrapping may be more economical. Use our Repair vs Replace Calculator to get a personalised recommendation.
Annually, each February, covering the prior full calendar year. This is our first published edition, establishing the baseline for future year‑on‑year comparisons.
Reconditioned engines are fully disassembled, cleaned, inspected, and rebuilt with new bearings, piston rings, seals, and gaskets. They are tested to factory specifications and come with a warranty. Used engines are sold as‑is, with no guarantee of internal condition. The extra cost reflects the labour and parts needed to bring the engine back to a like‑new state [EM-INTERVIEW].
Real Quote Data All prices drawn from actual supplier quotes sent through our platform.
Limitations Disclosed We state plainly what this data can and cannot tell you.
Annual Publication Refreshed every February – this is our founding baseline.
Independent & Transparent No manufacturer influence. Part of the Engine Finders network.
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