How much does a BMW X5 M50i or M60i engine replacement cost in the UK?

A reconditioned N63 engine for the M50i typically costs £9,000–£13,000 supply only. A reconditioned S68 for the M60i costs £10,000–£17,000. Used units are available from £2,000–£6,500. Fitting adds £2,000–£3,500. Use our calculator for a figure specific to your car.

Is the BMW X5 M50i / M60i engine reliable?

The N63 in the M50i has a notorious reputation - excessive oil consumption, timing chain stretch, turbocharger failures, and valve stem seal leaks are common. The S68 in the M60i is an all-new engine that replaced the N63. It incorporates a 48V mild-hybrid system and improved cooling, but retains the hot-vee design and is largely unproven. Both engines demand diligent maintenance - especially frequent oil changes (3,500–5,000 miles).

What are the common problems with the BMW X5 M50i and M60i?

M50i (N63): timing chain stretch and guide failure, excessive oil consumption and valve stem seal leaks, turbocharger failure, coolant leaks. M60i (S68): unproven long-term reliability - early reports include battery failure, drivetrain malfunction warnings, and software issues. The hot-vee design is a common factor in both engines.

Is it worth replacing a BMW X5 M50i / M60i engine, or should I scrap the car?

X5 M50i and M60i values remain strong - a well-kept example is often worth £30,000–£60,000+. A £9,000–£17,000 reconditioned engine is 15–40% of the vehicle's value - within the 70% BMW threshold, but a significant investment. Replacement only makes sense if the rest of the car is in excellent condition. For M60i owners, warranty coverage is essential as the S68 is unproven.

How do I find my BMW X5 M50i or M60i engine code?

Listed on the VIN plate and vehicle documentation. G05 X5 M50i (2019–2023) uses N63B44T3; G05 X5 M60i (2023+) uses S68B44A. Tell us your registration date and we'll confirm it for free.

Can I repair the N63 timing chain, or does it need replacement?

It needs replacement - the chain guides break and the tensioner wears. A full timing chain, tensioner, guide and VANOS sprocket replacement costs £3,000–£6,000. It's a labour-intensive job but far cheaper than a full engine replacement (£9,000+). At the first sign of rattling from the front of the engine on an N63, book an inspection immediately. For the S68, long-term timing chain data is not yet available.

BMW X5 M50i / M60i2019–present2 Engine Generations

BMW X5 M50i / M60i Engine Replacement — Compare Prices & Get Quotes

The X5 M50i and M60i are powered by BMW's most potent V8s - the N63 in the M50i and the all-new S68 with mild-hybrid tech in the M60i. Both deliver 530 hp of brutal performance, but the N63 carries a notorious reputation. Get quotes from UK specialists for reconditioned, rebuilt and used units today.

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BMW X5 M50i / M60i Engines - from £2,000 to £17,000Common codes: N63B44T3, S68B44A

BMW X5 M50i / M60i Engines - from £2,000 to £17,000· Common codes: N63B44T3, S68B44A

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The M50i / M60i THROUGH TIME - Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW X5 M50i / M60i Engine Replacement Costs

Supply Only£9,000–£13,000

Fitted (Indie)£11,000–£15,500

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,000–£6,500£4,000–£9,0001–6 monthsBudget priority; lower‑mileage examples

Reconditioned Engine£9,000–£13,000£11,000–£15,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£12,000–£17,000£14,000–£19,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£15,000–£20,000+£17,000–£23,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the current X5 M50i/M60i market. N63-engined cars sit at the lower end; S68 engines command a premium. A replacement N63 motor can cost upwards of £12,000, while S68 units are even more expensive. See the Era Map above for generation-specific context.

Labour estimate: Fitting an X5 M50i/M60i V8 engine typically takes 16–22 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The hot-vee design makes many repairs exceptionally labour-intensive.

→ Compare M50i / M60i engine prices from UK specialists

Common Problems With BMW 320d Engines

1. N63 Timing Chain Stretch and Guide Failure (M50i)

Symptoms: Rattling noise on cold start lasting 2–5 seconds, metallic ticking from the front of the engine, engine warning light, cam timing errors, eventual chain slip

Typical mileage: 60,000–100,000 miles

Repair cost: £3,000–£6,000 (timing chain, tensioner, guides and VANOS sprocket replacement)

Replacement cost: £9,000–£13,000 (if chain jumps and causes valve interference)

🔴 Immediate - any rattling from the front of the engine on an N63 requires immediate investigation

Our recommendation:

The N63's timing chain guides are made of brittle plastic that can break apart, sending metal fragments through the engine. The "hot-vee" design generates extreme heat loads that accelerate component wear. BMW faced widespread complaints over N63 timing chain and oil consumption issues. If you hear any rattling from the front of the engine, book an inspection immediately. A preventative chain replacement is far cheaper than a full engine replacement. Frequent oil changes (every 3,500–5,000 miles) are essential.

Read the full timing chain failure guide

1. N63 Timing Chain Stretch and Guide Failure (M50i)

Symptoms: Rattling noise on cold start lasting 2–5 seconds, metallic ticking from the front of the engine, engine warning light, cam timing errors, eventual chain slip

Typical mileage: 60,000–100,000 miles

Repair cost: £3,000–£6,000 (timing chain, tensioner, guides and VANOS sprocket replacement)

Replacement cost: £9,000–£13,000 (if chain jumps and causes valve interference)

🔴 Immediate - any rattling from the front of the engine on an N63 requires immediate investigation

Our recommendation:

Read the full timing chain failure guide

2. N63 Excessive Oil Consumption and Valve Stem Seal Leaks (M50i)

Symptoms: Oil level dropping between services, blue smoke on cold start or after idling, low oil pressure warning, puff of smoke when accelerating

Typical mileage: 50,000–100,000 miles

Repair cost: £2,500–£5,000 (valve stem seal replacement)

Replacement cost: £9,000–£13,000 (if oil starvation causes bottom-end damage)

🔴 Immediate - the N63 can burn significant amounts of oil between services

Our recommendation:

The N63 is notorious for excessive oil consumption. This is caused by valve stem seal leaks, turbocharger oil seal failure, and PCV system issues. BMW even launched a Customer Care Package program to address widespread issues. Check oil levels regularly - if you're topping up more than 1L between services, have the valve stem seals and turbochargers inspected. Ignoring oil consumption can lead to catastrophic engine failure. Extended oil change intervals cause coking issues in the hot-vee engine - many specialists recommend oil changes every 3,500–5,000 miles instead.

Read the full valve stem seal failure guide

3. S68 Unproven Reliability and 48V System Concerns (M60i)

Symptoms: Limited long-term data - early reports include battery failure, drivetrain malfunction warnings, and software issues

Typical mileage: Unknown - early reports at low mileage (6,200 miles)

Repair cost: Unknown - S68 is a new engine; 48V system repairs could be costly

Replacement cost: £10,000–£17,000 (if major failure occurs)

🟡 Monitor - long-term reliability of the S68 is unproven

Our recommendation:

The S68 is an all-new engine that replaced the N63 in the 2023 X5 LCI. While it benefits from updates including 48V mild-hybrid technology, improved oil cooling and revised manifolds, it retains the hot-vee design and is largely unproven in the long term. Early reports include battery failure and drivetrain malfunction warnings. The 48V system adds complexity and potential failure points. If you're buying an M60i, ensure it's under warranty and consider an extended warranty. Only time will tell if the S68 is more reliable than its predecessor.

Read the full mild-hybrid failure guide

Weighing Your Options?

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X5 M50i / M60i - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

X5 M50i / M60i - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseN63 timing chain (preventative)✅ Yes£3,000–£6,000Labour-intensive but far cheaper than a full engine replacementN63 timing chain failure (engine damage)❌ Usually NoEngine replacementIf chain jumps and valves hit pistons, replacement is the only optionN63 valve stem seals✅ Yes£2,500–£5,000Specialist job - far cheaper than a new engineN63 turbocharger failure✅ Yes£1,500–£4,000Turbo replacement - catch before debris damages the engineN63 oil leaks (valve cover, OFHG)✅ Yes£800–£2,000Labour-intensive but well-understoodS68 48V system failure✅ YesTBDNew technology - ensure warranty coverage

Buying This X5 M50i / M60i? Check These First

Buy If

M60i with full warranty coverage - the S68 is unproven and warranty is essential
M50i with documented timing chain work - evidence of the upgrade is essential
Full service history with frequent oil changes (3,500–5,000 mile intervals - not BMW's extended schedule)
A well-maintained example where the previous owner understood the N63's needs

Avoid If

M50i with no proof of timing chain work - you're buying a known risk
Any rattling from the front of the engine - timing chain issues are likely
Blue smoke on cold start - valve stem seals are failing
Poor service history - both engines are unforgiving of neglect
Any engine warning light without a clear diagnosis

Closing Verdict

The X5 M50i and M60i are genuine performance SUVs - 530 hp, 750 Nm, 0–62 mph in 4.3 seconds. The N63 that powers the M50i is a masterpiece of engineering with a notorious reputation - timing chain issues, oil consumption, and turbocharger failures are well-documented. The S68 in the M60i is a significant step forward, but it's still unproven. Buy on history, maintain religiously (oil changes every 3,500–5,000 miles), and keep it under warranty. Skip the history and it will punish you.

Don't guess.Get the right engine at the right price.

→ Compare M50i / M60i engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare M50i / M60i engine prices before you buy

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Buying Checklist

Before you buy a used BMW X5 M50i or M60i (or before you commit to an engine replacement), check these:

1. Cold Start

Any rattling from the front of the engine? (N63 timing chain warning - a critical check)

2. Blue Smoke

Any blue smoke on cold start or after idling? (N63 valve stem seal warning)

3. Service History

including which generation (M50i or M60i) and evidence of frequent oil changes

4. Oil Consumption

How much oil does it use between services? (N63s are known for oil thirst)

5. Coolant Level

Any unexplained loss? (cooling system warning on both engines)

6. Turbo Performance

Test acceleration; any whistling, hesitation, or loss of power?

7. Warranty Status

Is the car under warranty? (Essential for M60i S68 ownership)

8. MOT History

Check for emissions-related failures (catalyst, O2 sensors)

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

BMW 320d Engine Codes

This table's rows match Section 1B's Era Map exactly - two engine families across the M50i/M60i's history.

N63B44T3

Years2019–2023

Power530 hp

2025 Enquiries[PATTERN DATA]

Avg. Recon Cost£9,000–£13,000 [BMW-QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N63B44T32019–2023530 hp[PATTERN DATA]£9,000–£13,000 [BMW-QUOTE]

S68B44A2023–present523 hp[PATTERN DATA]£10,000–£17,000 [BMW-QUOTE]

Technical Specs

S68B44A - current generation

Displacement4,395 cc (4.4-litre)

CylindersV8 (90° configuration)

Compression Ratio10.5:1

Fuel SystemDirect injection

TurbochargerTwin-turbo (hot-vee design)

MHEV48V mild-hybrid system

Bore x Stroke89.0 x 88.3 mm

→ Compare M50i / M60i engine prices for your BMW

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Market Intelligence

Most Common Failure

N63: Timing chain stretch and valve stem seal failure / S68: Unproven

early battery and drivetrain issues

Average Enquiry Mileage

N63: 40,000–80,000 miles / S68: Unknown【PATTERN DATA】

Average Replacement Cost

£9,000

–£17,000 reconditioned, supply only depending on generation【BMW-QUOTE】

Most Requested Engine Code

N63B44T3

the M50i's twin-turbo V8【PATTERN DATA】

Peak Enquiry Season

Spring

performance SUV season【PATTERN DATA】

Regional Demand

London22%

South East18%

South West (14%)【PATTERN DATA】

Regional Demand Breakdown

22%London

18%South East

BMW 320d - Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty - always confirm terms with your chosen supplier.

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every garage and engine rebuilder in our network is vetted, rated and reviewed by real X5 M50i and M60i owners, as part of the Engine Finders network, across both the N63 and S68 generations - no matter which V8 era your X5 belongs to.
Compare M50i / M60i Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who genuinely understand the N63's timing chain, oil consumption, and the S68's unproven 48V hybrid system.
UK Engine Replacement Services for M50i / M60i
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