BMW 1 Series 135i Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW 1 Series 135i engine specialists. Compare prices on reconditioned, rebuilt and used engines for your BMW 135i - covering the 3.0-litre N55 turbocharged straight-six in the E82 coupe, E88 convertible and early F20 hatchback, through to the B58 engine in later F20 M135i models.
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12-Month Warranty
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From £1,800 to £8,000+
Used from £1,500 · Reconditioned from £4,000 · Common codes: N55B30A, N55B30M0, B58B30
From £1,500
Tested, bare/short engine
From £4,000
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 135i Replacement Engineto Finding the Best BMW 1 Series 135i Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 1 Series 135i - Engine History & Specs at a Glance
The BMW 135i was launched in 2008 as the performance flagship of the first-generation 1 Series range, powered by a 3.0-litre twin-turbo N54 engine. In 2010, the N54 was replaced by the N55 - BMW's first production engine to combine a single twin-scroll turbocharger with Valvetronic and direct injection. The 135i badge continued through the E82 coupe, E88 convertible and into the F20 hatchback as the M135i, before being replaced by the M140i with the B58 engine in 2016.
Variant HistoryBMW 1 Series 135i - Engine History & Specs at a Glance
The BMW 135i was launched in 2008 as the performance flagship of the first-generation 1 Series range, powered by a 3.0-litre twin-turbo N54 engine. In 2010, the N54 was replaced by the N55 - BMW's first production engine to combine a single twin-scroll turbocharger with Valvetronic and direct injection. The 135i badge continued through the E82 coupe, E88 convertible and into the F20 hatchback as the M135i, before being replaced by the M140i with the B58 engine in 2016.
BMW 1 Series 135i
Fuel TypePetrol
Engine Size3.0L (2,979 cc)
Power Output Range306-326 hp across the variant's historyEngine History Timeline
N54B30 3.0L twin-turbo straight-six, 306 hp, launched in the E82 coupe and E88 convertible
N55B30A 3.0L single twin-scroll turbo straight-six, 306 hp, replaces the N54 in the E82/E88 135i
N55B30A 3.0L single turbo straight-six, 320 hp, launched in the F20 five-door and F21 three-door M135i
B58B30 3.0L single twin-scroll turbo straight-six, 326 hp, introduced in later F20 M135i models
M135i renamed M140i with B58 engine; the 135i badge is retired in the UK
Key Specs Snapshot
Fuel TypePetrolEngine Size3.0L (2,979 cc)Power Output Range306-326 hp across the variant's historyTorque Range400-450 NmYears Produced2008-2016Every engine fitted to the BMW 1 Series 135i is covered below, with UK rebuilt pricing and known failure points.
BMW 1 Series 135i Engine Codes - Specifications & Replacement CostBMW 1 Series 135i Engine Codes - Specifications & Replacement Cost
3.0L Turbocharged Petrol (2010-2012, E82/E88 135i)
Power Output306 hp (225 kW) @ 5,800 rpmTorque400 Nm @ 1,200-5,000 rpmDisplacement2,979 ccYears Fitted2010-2012
Compatible Trim Levels
- 135i
- 135i SE
- 135i Sport
- 135i M Sport (E82 coupe, E88 convertible)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,500-£2,500
Reconditioned
Addressed known issues, tested
£4,000-£5,500
Rebuilt
Full teardown, upgraded internals
£4,500-£7,000
Common Failure
The N55 is generally more reliable than the N54, but common issues include valve cover gasket leaks, VANOS solenoid failure, oil filter housing gasket leaks, and water pump failure. Valvetronic eccentric shaft wear can also occur. Timing chain issues are less common on the N55 than on the N20/N47, but chain stretch can still occur.
The BMW 1 Series 135i is powered by 3.0-litre turbocharged straight-six engines across its production life. Early cars use the N55 (and earlier N54), which is generally reliable but has well-documented issues with oil leaks, VANOS solenoids, and the cooling system. Later B58-powered cars are more robust but have their own early-production concerns, particularly around the oil pump drive system. Replacement demand for the BMW 135i is typically lower than for 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.
Valve Cover, Oil Filter Housing and VANOS Solenoid Seals
Affected Vehicles
BMW 1 Series 135i (N55B30, 2010-2015)
Typical Failure Mileage
50,000-100,000 miles
Root Cause
The N55 engine uses gaskets and seals that can become brittle and leak over time. The valve cover gasket, oil filter housing gasket, and VANOS solenoid seals are the most common leak points. A leaking valve cover gasket can cause oil to drip onto the exhaust manifold, producing a burning smell and smoke. On the N54 and N55, multiple leak sources in close proximity can make it difficult to identify the primary source.
Why It Happens
The N55 engine uses gaskets and seals that can become brittle and leak over time. The valve cover gasket, oil filter housing gasket, and VANOS solenoid seals are the most common leak points. A leaking valve cover gasket can cause oil to drip onto the exhaust manifold, producing a burning smell and smoke. On the N54 and N55, multiple leak sources in close proximity can make it difficult to identify the primary source.
Dealer (parts + labour)
£600-£900
Specialist (parts + labour)
£400-£600
What it involves
Replace valve cover gasket and PCV components
Suitability
Cost-effective if caught early
1 - 2 daysDealer (parts + labour)
£500-£800
Specialist (parts + labour)
£300-£500
What it involves
Replace oil filter housing gasket
Suitability
Address oil leaks before they cause further issues
1 - 2 daysDealer (parts + labour)
£400-£700
Specialist (parts + labour)
£250-£450
What it involves
Replace VANOS solenoid seals
Suitability
If VANOS-related fault codes are present
1 - 2 daysDealer (parts + labour)
£6,000-£9,000
Specialist (parts + labour)
£4,500-£7,000
What it involves
Complete rebuilt unit with new gaskets and seals
Suitability
If significant damage has occurred
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 |
|---|---|---|---|---|---|
 Valve Cover Gasket Replacement Minor | £600-£900 | £400-£600 | Replace valve cover gasket and PCV components | Cost-effective if caught early | 1 - 2 days |
 Oil Filter Housing Gasket Replacement Best Value | £500-£800 | £300-£500 | Replace oil filter housing gasket | Address oil leaks before they cause further issues | 1 - 2 days |
VANOS Solenoid Seal Replacement Best Value | £400-£700 | £250-£450 | Replace VANOS solenoid seals | If VANOS-related fault codes are present | 1 - 2 days |
Full Replacement - rebuilt engine Best Value | £6,000-£9,000 | £4,500-£7,000 | Complete rebuilt unit with new gaskets and seals | If significant damage has occurred | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2010-2015 BMW 1 Series 135i is currently valued at approximately £8,000-£18,000 depending on mileage, condition and body style (coupe and convertible models command a premium). This places the 135i 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 (especially M Sport or coupe models) worth £12,000+, a reconditioned or rebuilt engine with warranty is a sound investment.
Our Recommendation
Our Recommendation
The N55 is a reliable engine, and oil leaks are the most common issue. Address gasket leaks promptly - a £300-£600 specialist repair is far cheaper than dealing with the consequences of a major oil leak. If you notice white smoke or a burning smell, have the valve cover gasket inspected immediately. Unlike the N20, the N55 does not have widespread timing chain issues, making it a more dependable choice for long-term ownership.
Don't Let Engine Failure Write Off Your BMW 1 Series 135i
The N55 engine in your BMW 135i is one of BMW's most celebrated turbocharged straight-sixes - a reliable, characterful engine that deserves proper maintenance. Oil leaks, VANOS issues and water pump failure are the most common problems, and all are repairable without replacing the entire engine in most cases. Later B58-powered cars are more robust but require vigilance for early oil pump issues. Whether you need a preventative water pump replacement or a full rebuilt engine with upgraded components and a 12-month warranty, EnginesMarket connects you with vetted UK specialists who know the N55 and B58 inside out. Compare prices today and keep your BMW on the road.
Compare rebuilt N55B30A BMW 1 Series 135i 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 135i. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 1 Series 135i Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 1 Series 135i engine replacement cost-
A BMW 1 Series 135i engine replacement typically costs £4,000-£8,500 for a reconditioned or rebuilt N55 or B58 unit supply-only. With supply and fit, expect £5,000-£10,000 depending on the specialist and location.
- Used N55 engines: £1,500-£2,800
- Reconditioned N55: £4,000-£6,000
- Rebuilt B58 with warranty: £6,000-£8,500
- Main dealer estimates: £14,000-£18,000 for complete engine replacement
Question 2What engine is in the BMW 135i-
The BMW 135i is powered by a 3.0-litre turbocharged straight-six petrol engine. Early E82/E88 models (2010-2012) use the N55B30A producing 306 hp and 400 Nm of torque. The F20/F21 M135i (2012-2015) uses the N55B30M0 producing 320 hp and 450 Nm of torque. Late F20 models (2015-2016) use the B58B30 producing 326 hp.
- Engine Codes: N55B30A, N55B30M0, B58B30
- Displacement: 2,979 cc (N55) / 2,998 cc (B58)
- Power: 306-326 hp
- Torque: 400-450 Nm
Question 3Is the BMW 135i engine reliable-
The N55 engine in the BMW 135i is generally regarded as reliable, though not as bulletproof as the naturally aspirated N52. Common issues include oil leaks (valve cover gasket, oil filter housing gasket), VANOS solenoid failure, and water pump failure. The B58 is more reliable but early production examples (2016-2018) can suffer from oil pump drive gear issues. Unlike the N20, the N55 does not have widespread timing chain issues.
- N55 is more reliable than the N54 it replaced
- No widespread timing chain issues
- Regular maintenance is essential for longevity
Question 4How long does a BMW 1 Series 135i engine replacement take-
A BMW 1 Series 135i engine replacement typically takes 2-4 days for a specialist to complete, including removal of the old N55/B58 unit and fitting the replacement. 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 135i and M135i-
The BMW 135i and M135i are essentially the same car but with different naming conventions across generations. The E82/E88 135i (2010-2013) was never officially an M model, while the F20/F21 M135i (2012-2016) carried the M badge. Both use the N55 engine, but the M135i produces 320 hp compared to the E82's 306 hp. The late F20 M135i switched to the B58 engine producing 326 hp.
- E82/E88 135i: 306 hp, N55B30A
- F20/F21 M135i: 320 hp, N55B30M0 (2012-2015)
- F20/F21 M135i: 326 hp, B58B30 (2015-2016)
Question 6Does a BMW 1 Series 135i rebuilt engine come with a warranty-
Yes - every rebuilt BMW 1 Series 135i 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 N55 or 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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