Engines Market

BMW 340i SPECIALISTS

BMW 3 Series 340i Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK BMW 3 Series 340i engine specialists. Compare prices on reconditioned, rebuilt and used B58 engines for the F30 and G20 340i - the 3.0-litre turbocharged straight-six that set a new benchmark for performance and refinement.

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12-Month Warranty
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BMW 3 Series 340i Engine
from£4,000 to £6,500
  • Usedfrom £2,500
  • Reconditionedfrom £3,800
  • Common codesB58B30M0, B58B30M1, B58B30O1
BMW 3-series 340i Used Engine — B58B30M0BMW 3-seriesUsed Engine — B58B30M0BMW 3-series 340i Reconditioned Engine — B58B30M0BMW 3-seriesReconditioned Engine — B58B30M0BMW 3-series 340i Rebuilt Engine — B58B30M0BMW 3-seriesRebuilt Engine — B58B30M0

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3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

BMW 3 Series 340i Engine History & Specs at a Glance

The BMW 340i arrived in 2015 as the flagship petrol model of the F30 3 Series, replacing the 335i and introducing the all-new B58 engine. The B58 - a 3.0-litre turbocharged straight-six - represented a significant leap forward from the N55, with a closed-deck aluminium block, a single twin-scroll turbocharger, and air-to-liquid intercooling. It has since won multiple Ward's 10 Best Engines awards and is widely regarded as one of BMW's finest modern powerplants.

BMW 3 Series 340i
  1. 2015

    B58B30M0, 3.0-litre straight-six turbo (326 bhp / 240 kW) - F30 generation launched, replaced the N55-powered 335i

  2. 2015

    B58B30O1, 3.0-litre straight-six turbo (374 bhp / 275 kW) - Higher-output version for later applications

  3. 2019

    B58B30O1, 3.0-litre straight-six turbo (382 bhp) - G20 M340i generation, updated with mild-hybrid technology

  4. 2022

    B58B30M2, 3.0-litre straight-six turbo (386 bhp) - LCI update, increased power and torque

Every engine fitted to the BMW 3 Series 340i is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 3 Series 340i Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

B58B30M0 — 3.0L Petrol (2015-2018) engine

B58B30M0 — 3.0L Petrol (2015-2018)

Power Output
326 bhp / 240 kW at 5,500 rpm
Torque
450 Nm
Years Fitted
2015-2018

Can’t find your exact engine code?-> Get quotes for B58B30M0 BMW 3 Series 340i engine replacement

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Common Problems

BMW 3 Series 340i Engine Problems Repair Cost vs Replacement

The BMW 3 Series 340i's B58 engine is widely regarded as one of BMW's most reliable modern powerplants - but it's not immune to age-related issues. Coolant leaks, oil filter housing gasket failures, and valve cover gasket deterioration are the most common concerns. Rebuilt engines through EnginesMarket include upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

Coolant Leaks

Affected
BMW 3 Series 340i (B58B30, 2015-present)
Typical failure mileage
40,000-80,000 miles
Root cause
The B58's water-to-air intercooler uses seals that can degrade over time, leading to coolant leaks. The water pump and thermostat housing are also known failure points.

Repair options

Repair tierDealer priceSpecialist price
Coolant leak repair - intercooler seals£800-£1,500£400-£800
Coolant leak repair - water pump/thermostat£1,000-£1,800£500-£1,000
Full Replacement - rebuilt/reconditioned engine£8,000-£12,000£4,500-£7,500 (matches Section 4 rebuilt pricing)
Our recommendation
For B58 340i owners, preventative cooling system maintenance is the smart play. Replacing the water pump and thermostat housing at 60,000 miles costs far less than an engine replacement if a leak leads to overheating. Regularly check coolant levels and inspect for visible puddles under the vehicle.
-> Compare rebuilt B58 BMW 3 Series 340i engine prices

Oil Filter Housing and Valve Cover Gasket Leaks

Affected
BMW 3 Series 340i (B58B30, 2015-present)
Typical failure mileage
50,000-90,000 miles
Root cause
The oil filter housing gasket and valve cover gasket deteriorate over time due to heat cycling, leading to oil seeping out. If left unaddressed, oil pressure can drop, potentially causing more significant engine problems.

Repair options

Repair tierDealer priceSpecialist price
Oil filter housing gasket replacement£600-£1,000£300-£600
Valve cover gasket replacement£800-£1,400£400-£800
Full Replacement - rebuilt engine£8,000-£12,000£4,500-£7,500
Our recommendation
If you notice oil spots under your BMW 340i or smell burning oil, get the gaskets inspected immediately. Replacing the oil filter housing and valve cover gaskets at a specialist costs £300-£800 combined - a fraction of the cost of an engine replacement. Don't ignore oil leaks; they can lead to low oil pressure and catastrophic engine failure.
-> Compare rebuilt B58 BMW 3 Series 340i engine prices

PCV Valve and VANOS Solenoid Issues

Affected
BMW 3 Series 340i (B58B30, 2015-present)
Typical failure mileage
50,000-100,000 miles
Root cause
The B58's PCV valve can fail, particularly on cars with upgraded turbos, causing misfires and rough idle. VANOS solenoid O-rings degrade over time, affecting variable valve timing.

Repair options

Repair tierDealer priceSpecialist price
PCV valve replacement£400-£800£200-£400
VANOS solenoid replacement£500-£900£250-£500
Our recommendation
PCV valve and VANOS solenoid issues are relatively inexpensive to fix if caught early. A specialist can diagnose and replace these components for £200-£500. Don't ignore rough idle or misfires - they can indicate deeper issues if left unaddressed.
-> Compare rebuilt B58 BMW 3 Series 340i engine prices

Don't Let Engine Failure Write Off Your BMW 3 Series 340i

The BMW 340i's B58 engine is one of the finest straight-sixes ever built - but even the best engines need maintenance. Every rebuilt BMW 3 Series 340i engine through EnginesMarket comes with upgraded components addressing the original failure points, a minimum 12-month unlimited-mileage warranty, and nationwide delivery. Compare specialist prices today - and save thousands over main dealer rates.

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FAQ

BMW 3 Series 340i Engine ReplacementFrequently Asked Questions

Everything BMW 3 Series 340i owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare BMW 3 Series 340i Engine Prices Today

Comparing quotes for your BMW 3 Series 340i is free, quick, and completely no-obligation. Whether you need a used B58B30M0 for an F30, a reconditioned B58 for a cost-effective rebuild, or a fully rebuilt B58B30O1 for a G20 M340i, our network of UK specialists has the right engine for your exact 340i and engine code. Enter your registration above and start comparing today.

200+200+ BMW 3 Series 340i engines supplied through our network
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