BMW 6 Series G32 Gran TurismoLiftback2017–2023
Every engine fitted to the G32-generation BMW 6 Series Gran Turismo — from the 2.0-litre B48 four-cylinder to the 3.0-litre B58 six and the B57 diesel range.
Real UK costs, honest failure data, and the B58's defining role in this generation's ownership story.
Backed by real UK 6 Series enquiries in 2025 [BMW-VERIFIED].
Engine Database
Every engine fitted to the G32 6 Series Gran Turismo specifically — from the 2017 launch through the 2020 LCI facelift and the introduction of 48-volt mild-hybrid technology.
Overview
The BMW G32 is the second generation of the BMW Gran Turismo range, a 5-door liftback executive car produced from June 2017 to August 2023. Built on the BMW CLAR platform and based on the G30 5 Series, the G32 succeeded the F07 5 Series Gran Turismo. The engine line-up at launch included the 630i (2.0-litre B48 four-cylinder), 640i (3.0-litre B58 six-cylinder), 630d (3.0-litre B57 six-cylinder diesel), and 640d xDrive (3.0-litre B57 diesel).
A 620d (2.0-litre B47 four-cylinder diesel) was added in 2018. The 2020 LCI facelift introduced 48-volt mild-hybrid technology across the range. The G32 was discontinued in August 2023 with no direct successor.
Key Facts
Market Intelligence
The G32 6 Series Gran Turismo is a niche model; enquiries are concentrated on the B58 six-cylinder petrol and B57 diesel engines, with values ranging from £15,000 for early 620d examples to £35,000+ for well-specced 640i/640d models.
04Best & Worst Engines
Best Petrol Overall
B58B30 3.0-litre six-cylinder (640i) — The 340 bhp B58 is widely regarded as BMW's most reliable modern six-cylinder. Delivering 450 Nm of torque and 0-62 in 5.3 seconds, it offers genuine performance with proven durability. Mild-hybrid versions (2020+) add efficiency without compromising reliability.
“”
Who it's for: buyers who want the sweet spot of performance, refinement, and reliability.
Best Diesel Overall
B57D30 3.0-litre six-cylinder (630d/640d) — The 265–340 bhp B57 six-cylinder diesel delivers effortless torque (620–680 Nm), excellent refinement, and genuine durability. Timing chain issues are "exceedingly rare" compared to earlier BMW diesels.
“”
Who it's for: high-mileage buyers who want six-cylinder refinement without petrol running costs.
Highest Risk
B58B30 (early 640i) — While generally reliable, the B58 has documented high-pressure fuel pump (HPFP) failures and turbocharger wastegate rattle. HPFP failure causes long cranking, power loss, and misfires.
“”
Who it's for: buyers who accept the premium and keep the car under warranty.
Most Expensive Failure
B58B30 (640i)
“The 3.0-litre six-cylinder is the most expensive engine in the G32 line-up to replace, with reconditioned units costing £4,800–£8,000. HPFP replacement is a labour-intensive job — £800–£1,500 at a specialist — and turbocharger wastegate rattle can lead to full turbo replacement.”
Best Value
B47D20 2.0-litre diesel (620d) — The 190 bhp B47 diesel offers the best balance of performance, economy, and running costs. It's the most economical G32 engine, parts are widely available, and the recon cost is the lowest in the range. Post-recall EGR cooler units are reliable.
“”
Who it's for: buyers who prioritise running costs.
Most Overlooked
B48B20 2.0-litre petrol (630i) — Often overshadowed by the six-cylinder 640i, the 258 bhp B48 delivers genuine performance — 0-62 in 6.3 seconds — with the economy of a four-cylinder and the proven reliability of BMW's modular engine family.
“”
Who it's for: buyers who want petrol refinement without the six-cylinder's fuel consumption.
Best Petrol Overall
B58B30
3.0-litre six-cylinder (640i) — The 340 bhp B58 is widely regarded as BMW's most reliable modern six-cylinder. Delivering 450 Nm of torque and 0-62 in 5.3 seconds, it offers genuine performance with proven durability. Mild-hybrid versions (2020+) add efficiency without compromising reliability.
“”
Who it's for: buyers who want the sweet spot of performance, refinement, and reliability.
Best Diesel Overall
B57D30
3.0-litre six-cylinder (630d/640d) — The 265–340 bhp B57 six-cylinder diesel delivers effortless torque (620–680 Nm), excellent refinement, and genuine durability. Timing chain issues are "exceedingly rare" compared to earlier BMW diesels.
“”
Who it's for: high-mileage buyers who want six-cylinder refinement without petrol running costs.
Highest Risk
B58B30
(early 640i) — While generally reliable, the B58 has documented high-pressure fuel pump (HPFP) failures and turbocharger wastegate rattle. HPFP failure causes long cranking, power loss, and misfires.
“”
Who it's for: buyers who accept the premium and keep the car under warranty.
Most Expensive Failure
B58B30
(640i)
“The 3.0-litre six-cylinder is the most expensive engine in the G32 line-up to replace, with reconditioned units costing £4,800–£8,000. HPFP replacement is a labour-intensive job — £800–£1,500 at a specialist — and turbocharger wastegate rattle can lead to full turbo replacement.”
Best Value
B47D20
2.0-litre diesel (620d) — The 190 bhp B47 diesel offers the best balance of performance, economy, and running costs. It's the most economical G32 engine, parts are widely available, and the recon cost is the lowest in the range. Post-recall EGR cooler units are reliable.
“”
Who it's for: buyers who prioritise running costs.
Most Overlooked
B48B20 2.0-litre petrol (630i) — Often overshadowed by the six-cylinder 640i, the 258 bhp B48 delivers genuine performance — 0-62 in 6.3 seconds — with the economy of a four-cylinder and the proven reliability of BMW's modular engine family.
“”
Who it's for: buyers who want petrol refinement without the six-cylinder's fuel consumption.
Engine
Typical Mileage
Common Major Failure
Repair Cost (Specialist)
Replacement Cost (Recon)
Ownership Verdict
Best Petrol -reliable four-cylinder
Premium Choice -performance costsBest Diesel -most economicalSolid Choice -six-cylinder refinementPremium Diesel -effortless torqueEngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership VerdictBest Petrol -reliable four-cylinderPremium Choice -performance costsBest Diesel -most economicalSolid Choice -six-cylinder refinementPremium Diesel -effortless torque
The G32 rule
A £4,800–£8,000 B58 recon against a £12,000–£18,000 early G32 sits at 27–67% of the car's value. On a sub-£12,000 example, that brushes our 70% BMW threshold -we'll honestly tell you to walk away. Against a well-kept £20,000+ example, the same recon drops to a routine 24–40% -a repair decision, not a financial one. Value the car first.
Key Takeaways
Which G32 Costs Least To Own?
B47 620d -cheapest recon, best economy.
Which G32 Costs Most To Own?
B58 640i -HPFP and turbo repairs add cost.
Which G32 Is Best Value?
B47 620d -the sweet spot between economy, performance, and running costs.
B58
High-Pressure Fuel Pump (HPFP) Failure
Affected models:
G32 640i (2017–2020, B58B30A).
Typical failure mileage:
40,000–80,000 miles.
Root cause:
The high-pressure fuel pump on B58 engines can fail, leading to long cranking times before the engine starts, noticeable loss of power, engine misfires, and even stalling. The issue can be intermittent, making diagnosis challenging.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£1,200–£2,000
£800–£1,500
HPFP replacement, fuel system flush
Catastrophic (Replacement)
Dealer
Specialist
£5,500–£9,000
£4,800–£8,000
Full reconditioned engine
Our Recommendation
If your G32 640i exhibits long cranking or power loss, have the HPFP inspected immediately -an £800–£1,500 preventative repair is cheaper than the £4,800–£8,000 replacement that follows if ignored.
B58
Turbocharger Wastegate Rattle
Affected models:
G32 640i (B58B30A/C), all years.
Typical failure mileage:
50,000–100,000 miles.
Root cause:
The wastegate components on B58 engines can wear over time, leading to a distinct rattling noise, especially noticeable at low RPMs or when the engine is idling. While it may not immediately affect performance, it can worsen and potentially lead to turbocharger failure.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£1,000–£2,000
£800–£1,500
Wastegate actuator replacement
Catastrophic (Replacement)
Dealer
Specialist
£3,500–£5,500
£2,500–£4,000
Complete turbocharger assembly replacement
Our Recommendation
On any G32 640i, listen for wastegate rattle at idle -an £800–£1,500 preventative repair is cheaper than the £2,500–£4,000 turbo replacement that follows if ignored.
B47/B57
Diesel EGR Cooler & DPF Issues
Affected models:
G32 620d (B47D20B), 630d/640d (B57D30A/B).
Typical failure mileage:
60,000–120,000 miles.
Root cause:
The EGR cooler on B47 and B57 diesel engines can develop internal coolant leaks, leading to coolant loss. DPF blockage is also common on cars used predominantly for urban driving, with fault codes indicating DPF sensor failure.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£800–£1,500 (EGR recall work free if applicable)
£500–£1,200
EGR cooler replacement, DPF regeneration
Catastrophic (Replacement)
Dealer
Specialist
£4,000–£6,000
£2,800–£5,000
Full reconditioned engine
Our Recommendation
On any G32 diesel, check the EGR cooler recall status immediately and ensure regular motorway runs for DPF regeneration -a £500–£1,200 preventative repair is cheaper than the £2,800–£5,000 replacement that follows if ignored.
VariantEngine Code
Used (Supply)
Reconditioned (Supply)
Rebuilt (Supply)
Labour Hours
Diesel Variants
Petrol Variants
Scope note: All variants listed are G32 6 Series Gran Turismo only. The 620d was added in 2018. The 2020 LCI facelift introduced 48-volt mild-hybrid technology across the range. The 640i and 640d are available with rear-wheel drive or xDrive all-wheel drive.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,000 supply-only
[BMW-QUOTE]
Most Common Failures
Live FeedBMW 6 Series 640i G32
B58
Birmingham
Long cranking, HPFP fault4
enquiries
Updated MonthlyBMW 6 Series 630d G32
B57
LondonDPF warning light, regeneration issue3
enquiries
Updated MonthlyBMW 6 Series 620d G32
B47
ManchesterCoolant loss, EGR cooler2
enquiries
Updated MonthlyMost Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,000 supply-only
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,000 supply-only
[BMW-QUOTE]
Most Common Failures
Diesel Variants
Petrol Variants
Scope note: All variants listed are G32 6 Series Gran Turismo only. The 620d was added in 2018. The 2020 LCI facelift introduced 48-volt mild-hybrid technology across the range. The 640i and 640d are available with rear-wheel drive or xDrive all-wheel drive.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,000 supply-only
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,000 supply-only
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,000 supply-only
[BMW-QUOTE]
Most Common Failures
Live FeedBMW 6 Series 640i G32
B58
BirminghamLong cranking, HPFP fault4
enquiries
BMW 6 Series 630d G32
B57
LondonDPF warning light, regeneration issue3
enquiries
BMW 6 Series 620d G32
B47
ManchesterCoolant loss, EGR cooler2
enquiries
Updated MonthlyTrusted G32 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real G32 owners, as part of the Engine Finders network.
Compare G32 Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit.
UK Engine Replacement Services for G32
covering every variant from 620d to 640i xDrive, with supply-only or full supply & fit available nationwide.
Find the best BMW 6 Series G32 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.
Compare BMW 6 Series G32 Engine Prices on EnginesMarket