How much does a BMW X7 xDrive40i engine replacement cost in the UK?

A reconditioned B58 engine typically costs £4,000–£7,500 supply only depending on which generation (pre-LCI or LCI), with used units available from £2,000–£4,500. Fitting adds £1,500–£2,500 depending on the workshop. Use our calculator for a figure specific to your car.

Is the BMW X7 xDrive40i engine reliable?

Yes - the B58 is widely regarded as one of BMW's most reliable modern engines. It's a significant improvement over the N55 and shares its architecture with the bulletproof B58 used across BMW's range and in the Toyota Supra. The main weaknesses are the oil filter housing (plastic, can crack), cooling system components, and carbon build-up on intake valves - all are well-understood and repairable.

What are the common problems with the BMW X7 xDrive40i?

Oil filter housing cracking (causing coolant and/or oil leaks - BMW faces a class action lawsuit over this), cooling system leaks (water pump and hoses), and carbon build-up on intake valves. The B58 is fundamentally robust - these are maintenance items, not catastrophic design flaws.

Is it worth replacing a BMW X7 xDrive40i engine, or should I scrap the car?

X7 values remain strong - a well-kept example is often worth £30,000–£60,000+. A £4,000–£7,500 reconditioned engine is only 10–20% of the vehicle's value - well within the 70% BMW threshold. Replacement is almost always worthwhile on a cherished example.

How do I find my BMW X7 xDrive40i engine code?

Listed on the VIN plate and vehicle documentation. G07 X7 (2019–2022) uses B58B30C; G07 LCI X7 (2022+) uses B58B30P. Tell us your registration date and we'll confirm it for free.

Can I repair the B58 oil filter housing, or does it need replacement?

It needs replacement - the plastic housing cracks and cannot be reliably repaired. Replacement costs £800–£1,800 and is labour-intensive due to the intake manifold needing removal. Upgraded metal housings are available and recommended. BMW faces a class action lawsuit over this issue. If you notice coolant or oil loss, have it inspected immediately.

BMW X7 xDrive40i2019–presentB58 Straight-Six

BMW X7 xDrive40i Engine Replacement — Compare Prices & Get Quotes

The X7 xDrive40i is powered by BMW's legendary B58 3.0-litre straight-six - a masterpiece of modern engineering that's widely regarded as one of BMW's most reliable engines. The later LCI models add 48V mild-hybrid assistance. Get quotes from UK specialists for reconditioned, rebuilt and used units today.

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BMW X7 xDrive40i Engines - from £2,000 to £8,500Common codes: B58B30C, B58B30P

BMW X7 xDrive40i Engines - from £2,000 to £8,500· Common codes: B58B30C, B58B30P

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The xDrive40i 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 X7 xDrive40i Engine Replacement Costs

Supply Only£4,000–£6,500

Fitted (Indie)£5,500–£8,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,000–£4,500£3,500–£6,0001–6 monthsBudget priority; lower‑mileage examples

Reconditioned Engine£4,000–£6,500£5,500–£8,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£5,500–£8,500£7,000–£10,00012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£7,000–£10,000+£8,500–£12,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the current X7 xDrive40i market. Pre-LCI B58 engines sit at the lower end; LCI B58P examples command a premium. See the Era Map above for generation-specific context.

Labour estimate: Fitting an X7 xDrive40i engine typically takes 14–18 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The X7's size and the B58's complexity make it a specialist job.

→ Compare xDrive40i engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Oil Filter Housing Cracking (B58)

Symptoms: Coolant loss with no visible external leak, oil spots under the car, low oil pressure warning, engine warning light, sweet smell from the engine bay, mixing of oil and coolant

Typical mileage: 60,000–100,000 miles

Repair cost: £800–£1,800 (oil filter housing replacement, including intake manifold removal)

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

The B58's oil filter housing is a known weak point. BMW chose to construct it out of plastic, and the housing tends to split if the cap is tightened too tight or even just over time as the plastic becomes brittle from numerous heat cycles. BMW is facing a class action lawsuit for faulty oil filter housings that leak coolant, resulting in owners having to spend thousands of dollars in repairs and replacements. Because it sits under the intake manifold, replacement is labour-intensive. Upgraded metal housings are available. Check for oil spots or coolant loss regularly, and investigate any drop in fluid levels promptly.

Read the full oil filter housing failure guide

1. Oil Filter Housing Cracking (B58)

Symptoms: Coolant loss with no visible external leak, oil spots under the car, low oil pressure warning, engine warning light, sweet smell from the engine bay, mixing of oil and coolant

Typical mileage: 60,000–100,000 miles

Repair cost: £800–£1,800 (oil filter housing replacement, including intake manifold removal)

Replacement cost: N/A - repair only

🟠 Check - book inspection urgently

Our recommendation:

Read the full oil filter housing failure guide

2. Cooling System Leaks (Water Pump and Hoses)

Symptoms: Coolant loss, rising temperature gauge, warning light, steam from the engine bay, heater not working properly

Typical mileage: 60,000–100,000 miles

Repair cost: £400–£1,200 (water pump or coolant hose replacement)

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon

Our recommendation:

Like the B58's predecessor, the cooling system is a common weak point. The electric water pump and plastic coolant hoses can fail over time. The X7's size and weight put additional strain on the cooling system. Replacing the water pump and hoses preventatively at around 70,000–80,000 miles is cheaper than dealing with an overheated engine. Check coolant levels regularly.

Read the full coolant leak guide

3. Carbon Build-up on Intake Valves (Direct Injection)

Symptoms: Rough idle, hesitation on acceleration, reduced fuel economy, engine warning light, misfire codes

Typical mileage: 60,000–100,000 miles

Repair cost: £400–£800 (walnut blasting intake valve cleaning)

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon

Our recommendation:

Like all direct-injection engines, the B58 suffers from carbon build-up on the intake valves. This is because fuel is injected directly into the cylinder, so the intake valves don't get washed by fuel. Russian specialists note that fluctuating idle after 100,000 km (62,000 miles) is often caused by carbon build-up on the intake valves. Walnut blasting is the standard cleaning method and is well-understood by BMW specialists. Regular use of quality fuel and occasional Italian tune-ups can help reduce build-up.

Read the full carbon build-up guide

Weighing Your Options?

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X7 xDrive40i - 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.

X7 xDrive40i - 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 SenseOil filter housing crack✅ Yes£800–£1,800Labour-intensive but well-understood; upgraded metal housing availableCooling system leaks✅ Yes£400–£1,200Straightforward replacement - catch before overheatingCarbon build-up✅ Yes£400–£800Walnut blasting - well-understood and effectiveTiming chain wear (rare)✅ Yes£1,500–£3,000The B58 is far more reliable than earlier chains - but tensioners can still wearEngine failure (catastrophic)❌ Usually NoEngine replacementRare on the B58 - but if it happens, replacement is the only option

Buying This X7 xDrive40i? Check These First

Buy If

Full service history with correct BMW-spec oil - the B58 is reliable but unforgiving of neglect
Evidence of cooling system maintenance - water pump or hoses replaced
LCI model (2022+) - the B58P with MHEV brings meaningful improvements
A well-maintained example where the previous owner understood the B58's needs

Avoid If

Evidence of repeated coolant top-ups without a diagnosed leak - the oil filter housing or cooling system is failing
Poor service history - the B58 is sensitive to oil quality
Any engine warning light without a clear diagnosis
Evidence of oil and coolant mixing - the oil filter housing has failed

Closing Verdict

The B58 is one of BMW's finest modern engines - a genuine step forward in reliability from the N55 that preceded it. The X7 xDrive40i combines this exceptional straight-six with the luxury and space of BMW's flagship SUV. Its weaknesses are well-understood: the oil filter housing (plastic, can crack), cooling system components, and carbon build-up. Buy on history, maintain on schedule, and the B58 will reward you with exceptional performance and longevity. The LCI's B58P with 48V mild-hybrid is the most refined version of this engine.

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

→ Compare xDrive40i 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 xDrive40i engine prices before you buy

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Buying Checklist

Before you buy a used BMW X7 xDrive40i (or before you commit to an engine replacement), check these:

1. Coolant Level

Any unexplained loss? (oil filter housing or cooling system warning)

2. Oil Condition

Any signs of coolant contamination? (milky appearance - oil filter housing failure)

3. Service History

including which generation (pre-LCI or LCI) and evidence of regular maintenance

4. Cold Start

Any rattles? (timing chain issues are rare on B58 but possible)

5. Idle Quality

Any rough idle or hesitation? (carbon build-up or injector issues)

6. Engine Warning Light

Have codes been read? Any unresolved issues?

7. Turbo Performance

Test acceleration; any hesitation, whistling, or wastegate rattle?

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 B58 variants across the X7 xDrive40i's history.

B58B30C

Years2019–2022

Power340 hp

2025 Enquiries[PATTERN DATA]

Avg. Recon Cost£4,000–£6,500 [BMW-QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

B58B30C2019–2022340 hp[PATTERN DATA]£4,000–£6,500 [BMW-QUOTE]

B58B30P2022–present375–381 hp[PATTERN DATA]£4,500–£7,500 [BMW-QUOTE]

Technical Specs

B58B30P - current generation

Displacement2,998cc (3.0-litre)

CylindersStraight-6

Compression Ratio11.0:1

Fuel SystemDirect injection

TurbochargerSingle twin-scroll turbocharger

ValvetrainDOHC, 4 valves per cylinder, Valvetronic, Double-VANOS, timing chain

MHEV48V mild-hybrid system (LCI models)

→ Compare xDrive40i engine prices for your BMW

Get quotes from trusted UK specialists in minutes.

Market Intelligence

Most Common Failure

Oil filter housing cracking

the primary weakness of the B58; BMW faces a class action lawsuit

Average Enquiry Mileage

40,000

–80,000 miles【PATTERN DATA】

Average Replacement Cost

£4,000

–£7,500 reconditioned, supply only depending on generation【BMW-QUOTE】

Most Requested Engine Code

B58

one of BMW's most celebrated modern engines【PATTERN DATA】

Peak Enquiry Season

Spring

luxury 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.

Trusted xDrive40i Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real X7 xDrive40i owners, as part of the Engine Finders network, across both the pre-LCI and LCI generations - whether you drive the B58B30C or B58B30P.
Compare xDrive40i Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who genuinely understand the B58's oil filter housing, cooling system, and carbon build-up nuances.
UK Engine Replacement Services for X7 xDrive40i
supply‑only or full supply & fit available nationwide, covering BMW's flagship SUV's straight-six with a 12‑month warranty as standard.

Find the best BMW X7 xDrive40i engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and keep your B58-powered X7 performing at its best.

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No hidden fees

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12-Month Warranty

As standard

Nationwide Delivery

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