BMW X3 G01SUV2017–2024
Every engine fitted to the third-generation X3 G01 — from the 2.0-litre B48 four-cylinder petrol in the sDrive20i and xDrive30i, to the 3.0-litre B58 six-cylinder in the M40i, the S58-powered X3 M, and the full range of B47 and B57 diesel options for UK buyers.
Real UK costs, honest reliability data, and the 2021 LCI updates that kept BMW's best-selling SUV competitive.
Backed by 182+ real UK G01 enquiries in 2025 [BMW-VERIFIED].
Engine Database
Every engine fitted to the G01 X3 — from the entry-level sDrive18d to the range-topping X3 M Competition, including the plug-in hybrid xDrive30e.
Overview
The BMW X3 G01 is the third generation of BMW's compact luxury crossover SUV, unveiled in June 2017 with production commencing in August 2017. Built on BMW's CLAR platform, the G01 brought significant improvements in interior space, technology, and driving dynamics over its F25 predecessor. Designed by Calvin Luk, the G01 is manufactured at BMW's Spartanburg plant in the USA and Rosslyn plant in South Africa.
The engine range includes B48 four-cylinder petrols (sDrive20i, xDrive20i, xDrive30i, and the xDrive30e plug-in hybrid), the B58 six-cylinder petrol in the M40i, the S58 in the X3 M and X3 M Competition, and B47/B57 diesels ranging from the sDrive18d to the M40d. A facelift (LCI) was introduced in 2021, and production ended in 2024.
Key Facts
Market Intelligence
The BMW X3 G01 generated 182 real UK engine enquiries in 2025 [EM-VERIFIED], concentrated on the B47 diesel fours and B58 petrol sixes as these SUVs age out of warranty.
04Best & Worst Engines
Best Diesel Overall
B57D30B (xDrive30d, 2017–2024)
“The 3.0-litre straight-six diesel produces 265 PS and 620 Nm — effortless, refined, and with the kind of torque that makes the G01 a genuine long-distance cruiser. The B57 is chain-driven and proven across the BMW range. In the X3, it's the diesel you buy if you want six-cylinder refinement without M40d running costs.”
Who it's for: buyers who want effortless torque and strong economy from a six-cylinder diesel.
Best Petrol Overall
B58B30O1 / B58B30B (M40i, 2017–2024)
“The B58 is BMW's modular straight-six masterpiece — 360 PS, 500 Nm, silky smooth, and chain-driven with a robust bottom end. The B58 is widely regarded as one of BMW's most reliable modern engines. In the G01 X3, it's the engine that defines the performance SUV experience.”
Who it's for: buyers who want six-cylinder performance with proven reliability. (Model-wide: B58B30 is the benchmark across the BMW range — the G01 offers one of the best expressions of it in an SUV.)
Highest Risk
B48B20A (sDrive20i / xDrive20i, early production)
“The B48 is a robust engine overall, but early production units can suffer from coolant leaks from the cylinder head vent line (coolant hose) — the plastic becomes brittle and snaps around 60,000 km, dumping coolant instantly. B48TU engines also have documented oil consumption issues.”
Who it's for: buyers who want entry-level X3 ownership with a budget for cooling system maintenance.
Most Expensive Failure
S58B30A (X3 M / X3 M Competition)
“The S58 is the high-performance M-division engine — up to 510 PS, twin-turbo, and complex. Turbocharger wear, cooling system demands, and M-specific component costs all add to the ownership burden. A full engine replacement sits at £8,000–£16,000.”
Who it's for: X3 M buyers who budget for high-end maintenance and have a specialist they trust.
Best Value
B47D20A / B47D20B (xDrive20d, 2017–2024)
“The xDrive20d's 2.0-litre four-cylinder diesel produces 190 PS and 400 Nm — the most efficient engine in the range, returning up to 50 mpg. The B47 is chain-driven with an accessible front-mounted chain — none of the N47's rear-chain anxiety. It's the X3 you can buy without diesel anxiety.”
Who it's for: high-mileage buyers who prioritise economy and reliability.
Most Overlooked
B48B20A (xDrive30e, 2017–2024)
“The xDrive30e plug-in hybrid combines the B48B20A petrol engine with an electric motor for 292 PS and electric-only range. It's the most fuel-efficient petrol option for urban buyers and offers the lowest company car tax. The B48's cooling system issues are the only caveat.”
Who it's for: buyers who want petrol refinement with EV running costs for short journeys.
Best Diesel Overall
B57D30B
(xDrive30d, 2017–2024)
“The 3.0-litre straight-six diesel produces 265 PS and 620 Nm — effortless, refined, and with the kind of torque that makes the G01 a genuine long-distance cruiser. The B57 is chain-driven and proven across the BMW range. In the X3, it's the diesel you buy if you want six-cylinder refinement without M40d running costs.”
Who it's for: buyers who want effortless torque and strong economy from a six-cylinder diesel.
Best Petrol Overall
B58B30O1
/ B58B30B (M40i, 2017–2024)
“The B58 is BMW's modular straight-six masterpiece — 360 PS, 500 Nm, silky smooth, and chain-driven with a robust bottom end. The B58 is widely regarded as one of BMW's most reliable modern engines. In the G01 X3, it's the engine that defines the performance SUV experience.”
Who it's for: buyers who want six-cylinder performance with proven reliability. (Model-wide: B58B30 is the benchmark across the BMW range — the G01 offers one of the best expressions of it in an SUV.)
Highest Risk
B48B20A
(sDrive20i / xDrive20i, early production)
“The B48 is a robust engine overall, but early production units can suffer from coolant leaks from the cylinder head vent line (coolant hose) — the plastic becomes brittle and snaps around 60,000 km, dumping coolant instantly. B48TU engines also have documented oil consumption issues.”
Who it's for: buyers who want entry-level X3 ownership with a budget for cooling system maintenance.
Most Expensive Failure
S58B30A
(X3 M / X3 M Competition)
“The S58 is the high-performance M-division engine — up to 510 PS, twin-turbo, and complex. Turbocharger wear, cooling system demands, and M-specific component costs all add to the ownership burden. A full engine replacement sits at £8,000–£16,000.”
Who it's for: X3 M buyers who budget for high-end maintenance and have a specialist they trust.
Best Value
B47D20A
/ B47D20B (xDrive20d, 2017–2024)
“The xDrive20d's 2.0-litre four-cylinder diesel produces 190 PS and 400 Nm — the most efficient engine in the range, returning up to 50 mpg. The B47 is chain-driven with an accessible front-mounted chain — none of the N47's rear-chain anxiety. It's the X3 you can buy without diesel anxiety.”
Who it's for: high-mileage buyers who prioritise economy and reliability.
Most Overlooked
B48B20A (xDrive30e, 2017–2024)
“The xDrive30e plug-in hybrid combines the B48B20A petrol engine with an electric motor for 292 PS and electric-only range. It's the most fuel-efficient petrol option for urban buyers and offers the lowest company car tax. The B48's cooling system issues are the only caveat.”
Who it's for: buyers who want petrol refinement with EV running costs for short journeys.
Engine
Typical Mileage
Common Major Failure
Repair Cost (Specialist)
Replacement Cost (Recon)
Ownership Verdict
Best Diesel Value -efficient, chain accessibleSolid Choice -231 PS, proven B47Best Diesel -265 PS, six-cylinder refinement
Performance Diesel -326 PS, complex but rewardingSolid Choice -efficient, watch cooling systemBest Petrol Value -252 PS, proven B48Hybrid Choice -low tax, watch battery healthBest Petrol -360 PS, the M40i's defining assetPerformance Choice -480 PS, M-division costs
Most Expensive -510 PS, ultimate M costsEngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership VerdictBest Diesel Value -efficient, chain accessibleSolid Choice -231 PS, proven B47Best Diesel -265 PS, six-cylinder refinementPerformance Diesel -326 PS, complex but rewardingSolid Choice -efficient, watch cooling systemBest Petrol Value -252 PS, proven B48Hybrid Choice -low tax, watch battery healthBest Petrol -360 PS, the M40i's defining assetPerformance Choice -480 PS, M-division costsMost Expensive -510 PS, ultimate M costs
The G01 rule
A £4,500–£7,500 B58 recon against a £15,000–£45,000 G01 sits at 10–50% of the car's value -well within our 70% BMW threshold. Even the most expensive engine replacement (X3 M Competition S58 at £9,000–£16,000) is only 20–107% of a well-kept G01's value. On a sub-£15,000 high-mileage X3 M, that crosses our 70% threshold -we'd advise walking away. Value the car first. Extended warranty cover is strongly recommended, especially for S58 models and the 48V mild-hybrid system.
B48
Coolant Leaks (Cylinder Head Vent Line)
Affected models:
G01 sDrive20i, xDrive20i, xDrive30i, xDrive30e (B48 four-cylinder petrol).
Typical failure mileage:
37,000–60,000 miles (60,000 km).
Root cause:
The B48's cylinder head vent line (coolant hose) is made of plastic that becomes brittle with heat cycling -it can snap, dumping coolant instantly. This is the defining weakness of the B48 across the BMW range. B48TU engines also have documented oil consumption issues.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£600–£1,200
£400–£800
Catastrophic (Replacement)
Dealer
Specialist
£1,500–£3,000
£1,000–£2,000
Our Recommendation
On any B48-powered G01 over 40,000 miles, have the coolant system inspected at every service -a £400–£800 preventative repair is far cheaper than the £1,000–£2,000 cooling system overhaul or engine replacement that follows an overheat event. The B48 is otherwise a robust engine.
B47
Timing Chain Wear (xDrive20d / sDrive18d)
Affected models:
G01 sDrive18d, xDrive20d, xDrive25d (B47 four-cylinder diesel).
Typical failure mileage:
80,000–150,000 miles.
Root cause:
The B47's timing chain is front-mounted and significantly more durable than the N47's rear-mounted design. However, the chain relies on plastic tensioner rails that can soften and crack when exposed to diluted oil, allowing the chain to slap against the timing cover -creating a tell-tale cold-start rattle.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£1,200–£2,000
£800–£1,500
Catastrophic (Replacement)
Dealer
Specialist
£4,500–£6,500
£2,800–£4,500
Our Recommendation
On any B47-powered G01, listen for cold-start rattle -a metallic clatter lasting 2–5 seconds after ignition. At the first sign, get the chain inspected immediately -an £800–£1,500 preventative repair is dramatically cheaper than the £2,800–£4,500 replacement that follows if ignored.
B57
/ B58 Cooling System Maintenance
Affected models:
G01 xDrive30d, M40d, M40i (B57 and B58 six-cylinder).
Typical failure mileage:
60,000–100,000 miles.
Root cause:
The B57 and B58's cooling systems use plastic components that can become brittle with age -the expansion tank and water pump are the most common failure points. The B57 also has documented EGR cooler issues.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£600–£1,200
£400–£800
Catastrophic (Replacement)
Dealer
Specialist
£1,500–£3,000
£1,000–£2,000
Our Recommendation
On any B57 or B58-powered G01 over 60,000 miles, have the cooling system inspected at every service -a £400–£800 preventative repair is far cheaper than the £1,000–£2,000 cooling system overhaul that follows. The B58 and B57 are otherwise robust engines.
S58
Turbocharger & Cooling System Wear (X3 M / X3 M Competition)
Affected models:
G01 X3 M, X3 M Competition (2019–2024, S58B30A).
Typical failure mileage:
50,000–100,000 miles.
Root cause:
The S58 is a high-performance engine with twin turbochargers and an M-specific cooling system. Turbochargers can suffer from oil leaks, worn bearings, or damaged turbine blades. The cooling system works harder than in standard models, increasing the risk of component fatigue.
Tiered Cost Table
Preventative (Repair)
Dealer
Specialist
£2,000–£5,000
£1,500–£4,000
Catastrophic (Replacement)
Dealer
Specialist
£12,000–£18,000
£8,000–£16,000
Our Recommendation
On any S58-powered X3 M, have the turbochargers and cooling system inspected at 50,000 miles -a £1,500–£4,000 preventative service is dramatically cheaper than the £8,000–£16,000 engine replacement that follows if ignored. The X3 M is rewarding but requires serious maintenance commitment.
VariantEngine Code
Used (Supply)
Reconditioned (Supply)
Rebuilt (Supply)
Labour HoursScope note: All variants listed are G01 X3 SUV only (2017–2024). The X3 M is designated F97 but is included on this page as it shares the G01 platform. The sDrive20i and sDrive18d are rear-wheel drive; all other variants are xDrive (all-wheel drive). The xDrive30e is a plug-in hybrid combining the B48B20A petrol engine with an electric motor for a combined 292 PS. The M40i uses the B58B30O1 (360 PS). The M40d uses the B57D30B (326 PS). The X3 M uses the S58B30A (480 PS) and the X3 M Competition produces 510 PS.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,500 supply only
[BMW-QUOTE]
Most Common Failures
Live FeedBMW X3 xDrive20d G01
B47
Manchester
Cold-start rattle5
enquiries
Updated MonthlyBMW X3 M40i G01
B58
BirminghamCooling system check4
enquiries
Updated MonthlyBMW X3 M Competition G01
S58
LondonTurbocharger inspection2
enquiries
Updated MonthlyMost Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,500 supply only
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,500 supply only
[BMW-QUOTE]
Most Common Failures
Scope note: All variants listed are G01 X3 SUV only (2017–2024). The X3 M is designated F97 but is included on this page as it shares the G01 platform. The sDrive20i and sDrive18d are rear-wheel drive; all other variants are xDrive (all-wheel drive). The xDrive30e is a plug-in hybrid combining the B48B20A petrol engine with an electric motor for a combined 292 PS. The M40i uses the B58B30O1 (360 PS). The M40d uses the B57D30B (326 PS). The X3 M uses the S58B30A (480 PS) and the X3 M Competition produces 510 PS.
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,500 supply only
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,500 supply only
[BMW-QUOTE]
Most Common Failures
Most Requested Engines (2025)
Most Requested Variants
Average Replacement Cost
£2,800–£8,500 supply only
[BMW-QUOTE]
Most Common Failures
Live FeedBMW X3 xDrive20d G01
B47
ManchesterCold-start rattle5
enquiries
BMW X3 M40i G01
B58
BirminghamCooling system check4
enquiries
BMW X3 M Competition G01
S58
LondonTurbocharger inspection2
enquiries
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