Jimmy
“Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
Get quotes today from trusted UK BMW M6 engine specialists. Compare prices on reconditioned, rebuilt and used engines - supply & fit available.
-> Rebuilt units from £4,500 · Common codes: S85B50, S85B50A, S85B50B, S85B50C
-> Rebuilt units from £5,500 · Common codes: S63B44A, S63B44B, S63B44C, S63T2
-> Rebuilt units from £6,500 · Common codes: S63B44C, S63T2, S63B44B (Competition)
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The table below shows typical UK rebuilt engine costs across BMW M6 variants, covering documented failure causes, engine codes, fuel types, and engine sizes based on current market data.

Customer Reviews
Rated 4.8 out of 5 by 1,081 verified customers who sourced reconditioned and used BMW M6 engines through EngineMarket.
Jimmy
“Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
Pete
“Got three quotes within an hour and chose the best deal easily. The whole process was quick, clear and stress-free.”
Sophie
“I wasn't sure what I needed, but they helped me identify the right engine and connected me with a trusted garage.”
Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
- Jimmy, London
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From the classic M635CSi to the high-performance Competition Package, our network of trusted UK BMW M6 engine specialists delivers rebuilt, reconditioned and used engine prices across every generation. A typical rebuilt M6 engine includes a 12-month warranty - supply & fit available nationwide.
Diesel Variants
Petrol Variants
Every engine code fitted to the BMW M6 across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Extracted from detailed petrol and performance engine families across BMW M6 variants.
The BMW M6’s S85 V10 and S63 V8 twin-turbo engines deliver breathtaking performance, but both have well-documented weak points that drive replacement demand among UK owners. The S85 dominates earlier E63/E64 generation failure searches, while S63 issues-turbo failures, oil consumption, and cooling system problems-define F06/F12/F13 ownership. Every rebuilt engine supplied through EnginesMarket includes upgraded internal components designed to address the original failure point, plus a minimum 12-month unlimited mileage warranty. Below, we break down the most common M6 engine failures by cost, repair tier, and whether replacement makes more sense than repair.
Every rebuilt engine includes a minimum 12-month unlimited mileage warranty.
The Most Notorious M6 Engine Weakness
| Repair Tier | Dealer Price | Specialist Price | What It Involves | Longevity / Suitability |
|---|---|---|---|---|
Preventative - Rod Bearing Replacement (before failure) Minor | £2,000 - £3,200 | £1,200 - £2,000 | Replace rod bearings, bolts, oil pump bolts, sump gasket, oil service | 60k-80k miles; suitable for any M6 without existing knock |
Intermediate - Bearing Replacement + Crankshaft Polish Intermediate | £3,500 - £5,000 | £2,200 - £3,500 | As above plus crankshaft removal, inspection, and polishing | 30k-60k miles; viable if damage caught early without scoring |
Full Replacement - Rebuilt / Reconditioned Engine Best Value | £14,000 - £18,000 | £6,000 - £9,000 (supply & fit) | Complete S85 replacement engine with upgraded bearings, bench tested, 12-month warranty | 60k+ mile lifespan; only viable option if crank is scored or rods damaged |
On a BMW M6 worth £15,000-£25,000, preventative rod bearing replacement is the single best investment you can make . Many specialists recommend this as routine maintenance before 80,000 miles-typically £1,200-£2,000 at an independent BMW specialist versus £14,000+ for a full engine replacement after catastrophic failure . If your M6 already has a persistent bottom-end knock or low oil pressure, stop driving immediately; you’re likely looking at a full rebuilt engine.
A failed M6 engine doesn't have to mean the end of the road for your high-performance coupe or convertible. EnginesMarket makes it simple to compare prices from trusted UK BMW M6 specialists-whether you need a rebuilt S85 V10 with upgraded rod bearings, an S63 V8 with reinforced turbos, or a complete supply-and-fit solution. Every engine supplied through our network carries a minimum 12-month unlimited mileage warranty, and our specialists nationwide offer delivery and fitting. Compare prices and get back on the road without the main dealer premium.
Compare BMW M6 Engine Replacement Prices Now →The BMW M6’s S85 V10 and S63 V8 twin-turbo engines deliver breathtaking performance, but both have well-documented weak points that drive replacement demand among UK owners. The S85 dominates earlier E63/E64 generation failure searches, while S63 issues-turbo failures, oil consumption, and cooling system problems-define F06/F12/F13 ownership. Every rebuilt engine supplied through EnginesMarket includes upgraded internal components designed to address the original failure point, plus a minimum 12-month unlimited mileage warranty. Below, we break down the most common M6 engine failures by cost, repair tier, and whether replacement makes more sense than repair.
Replace rod bearings, bolts, oil pump bolts, sump gasket, oil service
As above plus crankshaft removal, inspection, and polishing
Complete S85 replacement engine with upgraded bearings, bench tested, 12-month warranty
On a BMW M6 worth £15,000-£25,000, preventative rod bearing replacement is the single best investment you can make . Many specialists recommend this as routine maintenance before 80,000 miles-typically £1,200-£2,000 at an independent BMW specialist versus £14,000+ for a full engine replacement after catastrophic failure . If your M6 already has a persistent bottom-end knock or low oil pressure, stop driving immediately; you’re likely looking at a full rebuilt engine.
A failed M6 engine doesn't have to mean the end of the road for your high-performance coupe or convertible. EnginesMarket makes it simple to compare prices from trusted UK BMW M6 specialists-whether you need a rebuilt S85 V10 with upgraded rod bearings, an S63 V8 with reinforced turbos, or a complete supply-and-fit solution. Every engine supplied through our network carries a minimum 12-month unlimited mileage warranty, and our specialists nationwide offer delivery and fitting. Compare prices and get back on the road without the main dealer premium.
Compare BMW M6 Engine Replacement Prices Now →Disclaimer: All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket’s UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW M6 and engine code. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty-always confirm exact terms with your chosen supplier.
Every BMW M6 engine type is available through our UK network with typical price ranges based on variant, engine code and budget.
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EnginesMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific BMW M6 within hours.
Every displacement fitted to the BMW M6 is listed below with compatible engine codes, model years, power outputs and common failure notes to help you identify your exact unit.
The original M635CSi (E24) used BMW Motorsport's legendary M88/3 3.5-litre straight-six, producing 286hp and hand-built with individual throttle bodies. This engine established M-division's naturally aspirated performance ethos that would define the M6 lineage for decades to come.
| Engine Code(s) | M88, 3 |
| Compatible Models (UK) | M635CSi |
| Production Years | E24, 1983-1989 |
Timing chain tensioner wear at higher mileage; regular valve adjustments required
Not sure which engine size your BMW M6 needs? Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EnginesMarket include a minimum 12-month unlimited mileage warranty from UK BMW M6 specialists.
BMW M6 Engines Fuel Type
Choose your BMW M6 engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the original M635CSi to the final Competition Package.
The BMW M6 has been powered exclusively by high-performance petrol engines across three generations - from the legendary M88/3 straight-six to the S85 V10 and the twin-turbo S63 V8 that dominates replacement enquiries today.
Not sure which fuel type your BMW M6 has? Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK BMW M6 specialists.
This section maps every major engine change across the BMW M6 production timeline from 1983 to 2018, helping owners identify their exact unit and compare rebuilt engine prices from UK specialists.
Not sure which year your BMW M6 was built? Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK BMW M6 specialists.
FAQ
Question 1
The S85 V10 is thrilling but maintenance-intensive. With meticulous care, it can achieve high mileage, but rod bearing failure is a well-documented weak point that owners address preventatively.
Key points
Question 2
The S63 V8 is more reliable than the S85 but has its own issues: turbocharger wear, oil consumption from valve stem seals, and cooling system degradation in the hot-vee design.
Key points
Question 3
Expect £4,500-£8,500 for a rebuilt S85 V10 (supply only) or £5,500-£11,000 for a rebuilt S63 V8. Supply and fit adds £600-£1,200.
Key points
Question 4
On a car worth £15,000-£25,000, a £5,000-£8,000 engine replacement can be worthwhile if the car is otherwise sound. For very high-mileage cars, weigh the costs carefully.
Key points
Question 5
Choose the S85 V10 for naturally aspirated character and that 8,250rpm scream - but accept higher maintenance. Choose the S63 V8 for more torque, better reliability, and lower running costs.
Key points
Question 6
M6 engine replacement is not a DIY job. These are complex, high-performance engines requiring specialist tools, coding knowledge, and experience with M-division powertrains.
Key points
Question 7
Every 6,000 miles or annually - whichever comes first. Extended dealer intervals (15,000+ miles) are a primary cause of rod bearing and turbo failures on both S85 and S63 engines.
Key points
Question 8
Yes. Every engine supplied through EnginesMarket includes a minimum 12-month unlimited mileage warranty. Specialist rebuilders often offer extended 24-36 month coverage.
Key points
Question 9
The M6 used S85B50 V10 (2005-2010), S63B44A (2012-2014), S63B44B (2015-2018 LCI), S63B44C (2014-2015 Competition), and S63T2 (2015-2018 Competition LCI).
Key points
Question 10
The top killers are rod bearing wear (S85), turbocharger failure (S63), and oil starvation. Prevention requires strict maintenance, warm-up discipline, and proactive component replacement.
Key points
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