BMW 1 Series M140i Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW 1 Series M140i engine specialists. Compare prices on reconditioned, rebuilt and used engines for your BMW M140i - the 340 hp B58 turbocharged straight-six that defined the final rear-wheel-drive M Performance hatchback. Covering the B58B30 engine across the F20 and F21 generations from 2016 to 2019.
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12-Month Warranty
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From £3,500 to £8,500+
Used from £2,500 · Reconditioned from £3,500 · Common codes: B58B30A, B58B30M0, B58B30O0
From £2,500
Tested, bare/short engine
From £3,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 1 Series M140i Replacement Engineto Finding the Best BMW 1 Series M140i Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 1 Series M140i - Engine History & Specs at a Glance
The BMW M140i was launched in the summer of 2016 as the flagship performance model of the second-generation 1 Series, replacing the M135i. Powered by BMW's all-new B58 3.0-litre turbocharged straight-six producing 340 hp, it represented the pinnacle of the rear-wheel-drive hatchback era. With 500 Nm of torque, a 0-62 mph time of just 4.6 seconds (automatic) and the legendary chassis balance of the F20/F21, the M140i remains one of the most celebrated modern BMWs. Production ran from 2016 to 2019 across the F20 (five-door) and F21 (three-door) body styles.
Variant HistoryBMW 1 Series M140i - Engine History & Specs at a Glance
The BMW M140i was launched in the summer of 2016 as the flagship performance model of the second-generation 1 Series, replacing the M135i. Powered by BMW's all-new B58 3.0-litre turbocharged straight-six producing 340 hp, it represented the pinnacle of the rear-wheel-drive hatchback era. With 500 Nm of torque, a 0-62 mph time of just 4.6 seconds (automatic) and the legendary chassis balance of the F20/F21, the M140i remains one of the most celebrated modern BMWs. Production ran from 2016 to 2019 across the F20 (five-door) and F21 (three-door) body styles.
BMW 1 Series M140i
Fuel TypePetrol
Engine Size3.0L (2,998 cc)
Power Output340 hp (250 kW) @ 5,500 rpmEngine History Timeline
B58B30M0 3.0L single twin-scroll turbo straight-six, 340 hp (250 kW), launched with the F20 five-door and F21 three-door 1 Series
Optional xDrive all-wheel drive introduced alongside rear-wheel drive
Shadow Edition models introduced with extended black exterior styling
Production continues; B58 engine now well-established as one of BMW's most reliable six-cylinders
F20/F21 generation ends; the M140i badge is retired and replaced by the front-wheel-drive 128ti and M135i xDrive on the F40 platform
Key Specs Snapshot
Fuel TypePetrolEngine Size3.0L (2,998 cc)Power Output340 hp (250 kW) @ 5,500 rpmTorque500 Nm @ 1,500-4,500 rpmYears Produced2016-2019Every engine fitted to the BMW 1 Series M140i is covered below, with UK rebuilt pricing and known failure points.
BMW 1 Series M140i Engine Codes - Specifications & Replacement CostBMW 1 Series M140i Engine Codes - Specifications & Replacement Cost
3.0L Turbocharged Petrol (2016-2019)
Power Output340 hp (250 kW) @ 5,500 rpmTorque500 Nm @ 1,500-4,500 rpmDisplacement2,998 ccBore x Stroke84.0 mm x 94.6 mmCompression Ratio11.0:1Engine Code VariantsB58B30A, B58B30M0Years Fitted2016-2019
Compatible Trim Levels
- M140i
- M140i Shadow Edition
- M140i Performance Edition (F20 five-door, F21 three-door)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£2,500-£4,000
Reconditioned
Addressed known issues, tested
£3,500-£5,500
Rebuilt
Full teardown, upgraded internals
£4,500-£8,500
Main dealer new engine estimate
Tested, ready-to-fit engine
£14,000-£18,000 (parts only)
Forged build
B58R
£8,610+ inc. labour (parts and labour)
Common Failure
The B58 is generally regarded as one of BMW's most reliable engines, but early production examples (2016-2018) can suffer from oil pump drive gear issues. The oil pump chain guide used plastic components that can break under normal operating stress. A distinctive humming or whining noise from the engine, especially during cold starts, can indicate oil pump failure. Coolant leaks from the reservoir cap seals and charge-cooler punctures are also reported. Valve cover gasket leaks can occur on higher-mileage examples.
The BMW 1 Series M140i is powered exclusively by the B58B30 engine - a 3.0-litre single twin-scroll turbocharged straight-six that produces 340 hp and 500 Nm of torque. The B58 is widely regarded as one of BMW's most reliable modern engines, with far fewer major failure points than the N54 and fewer issues than the early N55. However, early production examples (2016-2018) have a well-documented weakness: the oil pump drive system. Coolant leaks, valve cover gasket wear and VANOS solenoid issues are also reported on higher-mileage cars. Replacement demand for the BMW M140i is relatively low compared to four-cylinder BMWs, but when failures occur, the cost of repair can be significant. Every rebuilt engine supplied through EnginesMarket includes upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.
The B58's Early Production Weakness
Affected Vehicles
BMW 1 Series M140i (B58B30, early production 2016-2018)
Typical Failure Mileage
30,000-80,000 miles
Root Cause
Early production B58 engines (2016-2018) used plastic components in the oil pump chain guide and tensioner. Under normal operating stress, these plastic parts can break, throwing off the tension on the oil pump chain and leading to inconsistent oil flow. A distinctive humming or whining noise from the engine, especially during cold starts, is the primary warning sign. If the oil pump fails, oil pressure drops rapidly, and the engine can suffer catastrophic damage within minutes.
Why It Happens
Early production B58 engines (2016-2018) used plastic components in the oil pump chain guide and tensioner. Under normal operating stress, these plastic parts can break, throwing off the tension on the oil pump chain and leading to inconsistent oil flow. A distinctive humming or whining noise from the engine, especially during cold starts, is the primary warning sign. If the oil pump fails, oil pressure drops rapidly, and the engine can suffer catastrophic damage within minutes.
Dealer (parts + labour)
£2,000-£3,000
Specialist (parts + labour)
£1,200-£2,000
What it involves
Replace oil pump drive gear, chain guide and tensioner with updated components
Suitability
If humming/whining noise is detected early
1 - 2 daysDealer (parts + labour)
£7,000-£10,000
Specialist (parts + labour)
£4,500-£8,500 (matches Section 4 rebuilt pricing)
What it involves
Supply & fit, upgraded oil pump components, 12-month warranty
Suitability
If oil pump failure has caused engine damage
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Oil Pump Drive Gear Replacement Minor | £2,000-£3,000 | £1,200-£2,000 | Replace oil pump drive gear, chain guide and tensioner with updated components | If humming/whining noise is detected early | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £7,000-£10,000 | £4,500-£8,500 (matches Section 4 rebuilt pricing) | Supply & fit, upgraded oil pump components, 12-month warranty | If oil pump failure has caused engine damage | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2016-2019 BMW 1 Series M140i is currently valued at approximately £12,000-£22,000 depending on mileage, condition and specification. This places the M140i firmly in the bracket where a rebuilt engine is a viable investment - replacement cost is typically small relative to vehicle value. For well-maintained, lower-mileage examples worth £16,000+, a reconditioned or rebuilt engine with warranty is a sound investment.
Our Recommendation
Our Recommendation
If your B58-powered M140i produces a humming or whining noise from the engine on cold start, have the oil pump drive system inspected immediately. Early detection can prevent catastrophic engine failure. BMW has repaired this issue under warranty for many affected vehicles, but if your car is out of warranty, a specialist repair is significantly cheaper than a full engine replacement. For owners planning to keep their M140i for the long term, upgrading to an aftermarket metal oil pump drive gear is a worthwhile preventative measure.
Don't Let Engine Issues Write Off Your BMW 1 Series M140i
The B58 engine in your BMW M140i is one of BMW's most celebrated turbocharged straight-sixes - a reliable, characterful engine that deserves proper maintenance. Early production oil pump issues, coolant leaks and valve cover gasket wear are the most common problems, and all are repairable without replacing the entire engine in most cases. Whether you need a preventative oil pump inspection or a full rebuilt engine with upgraded components and a 12-month warranty, EnginesMarket connects you with vetted UK specialists who know the B58 inside out. Compare prices today and keep your BMW on the road.
Compare rebuilt B58B30M0 BMW 1 Series M140i engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW 1 Series M140i. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 1 Series M140i Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 1 Series M140i engine replacement cost-
A BMW 1 Series M140i engine replacement typically costs £3,500-£8,500 for a reconditioned or rebuilt B58 unit supply-only. With supply and fit, expect £5,000-£10,000 depending on the specialist and location. A forged B58R engine build from a specialist can cost £8,610+ including labour. Main dealer new engine quotes can exceed £14,000 for parts alone.
- Used B58 engines: £2,500-£4,000
- Reconditioned B58: £3,500-£5,500
- Rebuilt B58 with warranty: £4,500-£8,500
Question 2What engine is in the BMW M140i-
The BMW M140i (F20/F21, 2016-2019) is powered by a 3.0-litre turbocharged straight-six petrol engine with the engine code B58B30. It produces 340 hp (250 kW) at 5,500 rpm and 500 Nm of torque from 1,500-4,500 rpm. The B58 features a single twin-scroll turbocharger, Valvetronic variable valve lift, direct injection and an aluminium crankcase.
- Engine Code: B58B30M0 / B58B30A
- Displacement: 2,998 cc
- Power: 340 hp
- Torque: 500 Nm
Question 3Is the BMW M140i engine reliable-
Yes - the B58 engine in the BMW M140i is widely regarded as one of BMW's most reliable modern engines. Unlike the N20 and N47, timing chain failure is not a known widespread issue on the B58. However, early production examples (2016-2018) can suffer from oil pump drive gear failure due to plastic components in the oil pump chain guide. Common issues include coolant leaks, valve cover gasket wear and VANOS solenoid failure on higher-mileage cars.
- B58 is more reliable than the N54 and early N55
- No widespread timing chain issues
- Early oil pump issues should be checked
- Regular maintenance is essential for longevity
Question 4How long does a BMW 1 Series M140i engine replacement take-
A BMW 1 Series M140i engine replacement typically takes 2-4 days for a specialist to complete, including removal of the old B58 unit and fitting the replacement. One specialist estimates labour time at approximately 15 hours. The complexity of the six-cylinder turbo engine means labour time is higher than for four-cylinder models.
- Supply-only: engine delivered next working day in many cases
- Supply and fit: allow 2-4 working days
- Mobile fitting options limited due to engine complexity
Question 5What's the difference between the BMW M140i and M135i-
Both the BMW M140i and M135i are performance models of the 1 Series, but they use different engines. The M135i (2012-2016) uses the N55 3.0-litre turbocharged straight-six producing 320 hp, while the M140i (2016-2019) uses the B58 3.0-litre turbocharged straight-six producing 340 hp.
- M135i: 320 hp, N55 engine
- M140i: 340 hp, B58 engine (more reliable, more powerful)
Question 6Does a BMW 1 Series M140i rebuilt engine come with a warranty-
Yes - every rebuilt BMW 1 Series M140i engine supplied through EnginesMarket comes with a minimum 12-month unlimited-mileage warranty. This covers the engine against manufacturing defects and component failure, giving you peace of mind when investing in a replacement B58 unit.
- 12-month warranty is standard on all rebuilt engines
- Some specialists offer extended warranty options
- Always confirm exact warranty terms with your chosen supplier
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