How much does a BMW 7 Series G70 engine replacement cost in the UK?

A reconditioned G70 engine typically costs £4,000–£12,000 supply only, depending on engine -the B58 six-cylinder sits at £4,000–£7,000, while the N63 V8 can reach £7,000–£12,000. Fitting adds £780–£1,560. Use our calculator for a personalised figure.

What are the common problems with the BMW 7 Series G70?

Water pump and cooling system failures on all B-series engines (B58, B57), valve stem seal and turbo coolant line issues on the N63 V8 (760i), battery degradation and cooling system issues on the PHEV models (750e/M760e), and long-term battery degradation on the electric i7 variants -plus the usual electronic gremlins expected from a high-tech luxury saloon.

Is the BMW 7 Series G70 reliable?

The G70 is still relatively new, but early indications are positive. The B58 and B57 engines have strong reputations from their use across the BMW range. The N63 V8 has been improved but remains complex. The PHEV and electric variants are still unproven long-term, but BMW's electric drivetrains have generally performed well. Overall, the G70 appears to be a dependable modern luxury saloon.

Which BMW 7 Series G70 engine should I avoid?

No engine is inherently problematic, but the N63 V8 (760i) is more complex and expensive to maintain than the six-cylinder options -budget accordingly. The PHEV and electric variants require consideration of battery health and charging infrastructure. If you don't need the V8's performance, the B58 is the smarter choice.

How do I know if my G70 engine needs replacing?

Overheating with no obvious external leak (cooling system failure), blue smoke on start-up (N63 valve stem seals), persistent check engine lights, or rough idle are the key warning signs. For PHEV and electric models, reduced range or charging issues may indicate battery problems. Use our diagnostic calculator for a personalised assessment.

Is it worth replacing a BMW 7 Series G70 engine, or should I scrap the car?

On a G70, replacement almost always makes sense. Against a £60,000 G70, a £5,000 B58 recon is 8% of the car's value -well within our 70% BMW threshold. Even against a lower-value example, the G70's high retained value means replacement is financially viable. On a V8 or PHEV example, the calculus is similar -the car's value justifies the replacement cost.

How long do BMW 7 Series G70 engines last?

The B58 can exceed 150,000–200,000 miles with proper maintenance. The B57 diesel is similarly durable. The N63 V8 can also reach high mileage but requires meticulous cooling system and valve train maintenance. The electric i7's battery is expected to last 150,000+ miles but will degrade over time.

What is the difference between the G70 and the G11/G12?

The G70 is the seventh-generation 7 Series (2022–present), built on the CLAR platform with a bold new design language, split headlights, and the first fully electric 7 Series -the i7. The G11/G12 is the sixth-generation 7 Series (2015–2022), with a more traditional design and a range of N-series and B-series engines. The G70 is significantly more technologically advanced and offers a wider range of powertrains including PHEV and electric.

How do I find my BMW 7 Series G70 engine code?

Listed on the VIN plate and vehicle documentation; block stamping is visible on the engine itself. Tell us your variant (735i, 740i, 760i, 740d, 750e, M760e, i7) and we'll identify it -20+ vetted specialists will confirm it for free.

BMW 7 Series G70Saloon2022–present

BMW 7 Series G70 Engines — The Complete UK Guide

Every engine fitted to the G70 saloon — from the B57 diesel six to the B58 petrol six, the N63 V8, and the electric i7.

Real UK replacement costs, honest failure data, and the plug-in hybrid options that define this generation.

Explore G70 Engines

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8+Engine Codes
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Engine Database

BMW 7 Series G70 Engine Codes — The Complete Database

Every engine fitted to the G70 saloon — from the six-cylinder petrol and diesel units to the V8, plug-in hybrids and the fully electric i7 range.

Engine CodeFuelPowerYearsReliabilityEnquiries (2025)Avg. Recon Cost

B58B30PB58PetrolMild-hybrid268–381 bhp2022–present★★★★★PATTERN DATA—(pattern data)£4,000–£7,000[PLACEHOLDER]

B57D30BB57DieselMild-hybrid286–300 bhp2022–present★★★★★PATTERN DATA—(pattern data)£4,500–£7,500[PLACEHOLDER]

N63B44TU3N63PetrolTwin-turbo544 bhp2022–present★★★★☆PATTERN DATA—(pattern data)£7,000–£12,000[PLACEHOLDER]

B58B30P (PHEV)B58Petrol PHEV483–571 bhp(system)2022–present★★★★★PATTERN DATA—(pattern data)£5,000–£9,000[PLACEHOLDER]

Electric (i7)eDriveElectric449–600 bhp2022–present★★★★★PATTERN DATA—(pattern data)N/A — EV battery replacement

Overview

BMW 7 Series G70 — Overview

The G70 is the seventh generation of the BMW 7 Series, unveiled on 20 April 2022 and produced since July 2022. Built on the CLAR platform (CLAR-II/WE), the G70 introduced a bold new design language with split headlights, a massive illuminated kidney grille, and the first fully electric 7 Series — the i7.

The G70 is offered with petrol, plug-in hybrid, diesel and battery electric powertrains.

Key Facts

PlatformBMW CLAR (CLAR-II/WE)
PredecessorBMW 7 Series G11/G12
SuccessorCurrent model — no successor announced
Sibling Body Styles in this GenerationG70 (standard wheelbase, Europe), G71 (long wheelbase, Asia)

Market Intelligence

As a current-generation model (2022–present), the G70 is still establishing its long-term reliability profile — but the B58 and B57 engines are already well-proven from their use across the BMW range.

04Best & Worst Engines

Best & Worst Engines

Thin-Data Summary

The G70's engine range is modern, efficient and broadly dependable. The B58 3.0-litre straight-six (735i, 740i) is the volume choice — 268–381 bhp, smooth power delivery, and a reputation for bulletproof reliability that has made it one of BMW's most dependable modern engines. The B57 3.0-litre diesel six (740d) is the torque king — 286–300 bhp and 670 Nm of effortless pulling power, with mild-hybrid assistance for improved efficiency. The N63 4.4-litre twin-turbo V8 (760i) delivers 544 bhp but retains the hot-vee architecture that can lead to heat-related issues on high-mileage examples. The plug-in hybrids (750e, M760e) combine the B58 with an electric motor for 483–571 bhp system output. The i7 electric variants offer 449–600 bhp with instant torque and zero emissions. If you're buying a G70, the B58 petrol is the sensible choice; the B57 diesel is for high-mileage drivers; the i7 is for those ready to go electric; the V8 demands a deeper budget.

Thin-Data Summary

BMW 7 Series G70
Ownership Economics

Engine

Typical Mileage

Common Major Failure

Repair Cost (Specialist)

Replacement Cost (Recon)

Ownership Verdict

B58 3.0 (735i/740i)40k–80kWater pump, cooling system£500–£1,200£4,000–£7,000

Best Petrol -well-proven B58

B57 3.0 Diesel (740d)40k–80kEGR cooler, DPF, AdBlue£600–£1,500£4,500–£7,500

Best Diesel -effortless torque

N63 4.4 V8 (760i)30k–60kValve stem seals, turbo coolant lines£1,500–£4,000£7,000–£12,000

Most Expensive -hot-vee V8 complexity

B58 PHEV (750e/M760e)30k–60kBattery degradation, cooling system£1,000–£3,000£5,000–£9,000

Solid Choice -hybrid complexity

i7 Electric30k–60kBattery degradation (long-term)£2,000–£5,000N/A

Future-Proof -no engine, but battery costs loom

Engine

Typical Mileage

Common Major Failure

Repair Cost (Specialist)

Replacement Cost (Recon)

Ownership Verdict

B58 3.0 (735i/740i)40k–80kWater pump, cooling system£500–£1,200£4,000–£7,000

Best Petrol -well-proven B58

B57 3.0 Diesel (740d)40k–80kEGR cooler, DPF, AdBlue£600–£1,500£4,500–£7,500

Best Diesel -effortless torque

N63 4.4 V8 (760i)30k–60kValve stem seals, turbo coolant lines£1,500–£4,000£7,000–£12,000

Most Expensive -hot-vee V8 complexity

B58 PHEV (750e/M760e)30k–60kBattery degradation, cooling system£1,000–£3,000£5,000–£9,000

Solid Choice -hybrid complexity

i7 Electric30k–60kBattery degradation (long-term)£2,000–£5,000N/A

Future-Proof -no engine, but battery costs loom

The G70 rule

A £4,000–£7,000 B58 recon against a £60,000 G70 sits at 7–12% of the car's value -well within our 70% BMW threshold. Against a £100,000 example, the same recon drops to 4–7% -a routine maintenance decision. On a G70, replacement almost always makes sense. The V8 and PHEV costs are higher but still proportional to the car's value.

Key Takeaways

Which G70 Costs Least To Own?
B58 740i -simpler than the V8, lower running costs.
Which G70 Costs Most To Own?
N63 760i -hot-vee V8 with expensive heat-related failures.
Which G70 Is Best Value?
B58 740i -six-cylinder luxury without the V8 bills.

Common Problems

B58/B57

Cooling System & Water Pump Failure

Affected models:

G70 735i, 740i (B58), 740d (B57) -all models with B-series engines.

Typical failure mileage:

40,000–80,000 miles.

Root cause:

BMW's B-series engines use an electric water pump that has a finite service life. The water pump can fail without warning, causing overheating. The cooling system also has plastic components (thermostat housing, coolant pipes) that can become brittle with age and heat cycling.

Our Recommendation

Replace the water pump proactively at 60,000–80,000 miles on any B58 or B57-powered G70 -a £400–£800 preventative job is far cheaper than a £4,000+ engine replacement. Monitor the temperature gauge and investigate any coolant loss immediately.

Compare B58/B57 engine prices for your G70

N63

Hot-Vee V8 Heat-Related Failures

Affected models:

G70 760i xDrive (2022–present, N63 engine).

Typical failure mileage:

30,000–60,000 miles.

Root cause:

The N63's "hot-vee" design places the turbochargers inside the V of the engine, generating significant heat. This leads to premature failure of valve stem seals (causing blue smoke on start-up), turbo coolant lines, and the battery drain issues associated with the N63. The N63TU3 (2022–present) improved some aspects but retained the hot-vee architecture.

Our Recommendation

If you own an N63-powered G70, budget for valve stem seal replacement as a preventative measure -a £500–£1,200 investment is far cheaper than the £7,000–£12,000 engine replacement that follows a failure. Monitor oil consumption and investigate any blue smoke on start-up immediately.

Compare N63 engine prices for your G70 760i

PHEV

Battery & Cooling System (750e/M760e)

Affected models:

G70 750e xDrive, M760e xDrive (2022–present).

Typical failure mileage:

30,000–60,000 miles.

Root cause:

The plug-in hybrid system uses an 18.7 kWh lithium-ion battery pack that can degrade over time, particularly if regularly fast-charged or exposed to extreme temperatures. The cooling system for the battery and electric motor is more complex than on conventional engines and can develop leaks.

Our Recommendation

If you own a PHEV G70, have the battery health checked at every major service. Avoid frequent fast-charging if possible, and keep the battery between 20% and 80% charge for daily use. A £300–£600 preventative check is far cheaper than a £6,000+ battery replacement.

Compare PHEV battery prices for your G70

Electric Drive Unit & Battery (Long-Term)

Affected models:

G70 i7 eDrive50, i7 xDrive60, i7 M70 xDrive (2022–present).

Typical failure mileage:

50,000–100,000 miles (estimated).

Root cause:

The i7's electric motors and battery pack are generally reliable, but the battery will degrade over time, reducing range. The cooling system for the battery is complex and can develop leaks. Electric drive units can also fail, though this is rare.

Our Recommendation

If you own an i7, have the battery health checked annually. Keep the battery between 20% and 80% charge for daily use, and avoid frequent DC fast-charging. The i7 is still too new to have a proven long-term reliability record, but early indications are positive.

Compare i7 battery prices for your G70

G70
Engine Replacement Costs -By Engine and Condition

Variant

Engine Code

Used (Supply)

Reconditioned (Supply)

Rebuilt (Supply)

Labour Hours

735i / 740iB58B30P£2,500–£4,500£4,000–£7,000£5,500–£8,50012–16 hrs

740d xDriveB57D30B£2,800–£5,000£4,500–£7,500£6,000–£9,50012–16 hrs

760i xDriveN63B44TU3£4,500–£7,000£7,000–£12,000£9,000–£15,00018–24 hrs

750e xDrive / M760e xDriveB58 PHEV£3,500–£6,000£5,000–£9,000£7,000–£11,00014–18 hrs

i7 eDrive50 / xDrive60 / M70ElectricN/A -battery replacement onlyN/AN/AN/A

Diesel & Petrol Lineup

Diesel Variants

740d xDrive

Petrol Variants

Scope note: All variants listed are G70-generation 7 Series only (2022–present). The G71 long-wheelbase variant shares the same engines but is covered on its own Generation Page.

Market Intelligence

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Diesel & Petrol Lineup

Diesel Variants

740d xDrive

Petrol Variants

Scope note: All variants listed are G70-generation 7 Series only (2022–present). The G71 long-wheelbase variant shares the same engines but is covered on its own Generation Page.

Market Intelligence

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

FAQ

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Compare BMW 7 Series G70 Engine Prices on EnginesMarket

BMW 7 Series G70 Engines — The Complete UK Guide

BMW 7 Series G70 Engine Codes — The Complete Database

BMW 7 Series G70 — Overview

Best & Worst Engines

BMW 7 Series G70 Ownership Economics

Common Problems

G70Engine Replacement Costs -By Engine and Condition

Diesel & Petrol Lineup

Market Intelligence

Diesel & Petrol Lineup

Market Intelligence

FAQ

Why UK BMW 7 Series G70 OwnersTrust bmwengines.uk

BMW 7 Series G70
Ownership Economics

G70
Engine Replacement Costs -By Engine and Condition

Why UK BMW 7 Series G70 Owners
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