Engines Market

BMW Z4 30i SPECIALISTS

BMW Z4 30i Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK BMW Z4 30i engine specialists. Compare prices on reconditioned, rebuilt and used 3.0-litre straight-six engines for the E85 and E89 Z4 - supply & fit available nationwide.

Supply & Fit Available
12-Month Warranty
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100+ Suppliers
BMW Z4 30i Engine
from£1,495 to £3,800
  • Usedfrom £1,100
  • Reconditionedfrom £1,800
  • Common codesM54B30, N52B30, N52B30O1
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How it works

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 Z4 30i Engine History & Specs at a Glance

The BMW Z4 30i badge spans two generations of the iconic roadster - the E85/E86 (2003-2008) and the E89 (2009-2016) - with two distinct 3.0-litre straight-six engines. The earlier M54B30 delivered 231hp with classic BMW inline-six character, while the later N52B30 introduced Valvetronic and magnesium-aluminium construction for 258hp and improved efficiency. Together, these engines represent the most popular naturally aspirated six-cylinder Z4s in the UK market.

BMW Z4 30i
  1. 2003

    E85 Z4 3.0i launched with M54B30, 231hp, 300Nm, dual-VANOS

  2. 2006

    E85 facelift: 3.0i replaced by 3.0si with N52B30, 265hp, Valvetronic

  3. 2006

    2008 - Z4 M (S54) and 3.0si (N52) produced alongside each other

  4. 2009

    E89 Z4 sDrive30i launched with N52B30, 258hp, 310Nm, retractable hardtop

  5. 2016

    End of E89 production; Z4 30i badge discontinued until G29 M40i

  6. 2019

    present - G29 Z4 M40i uses B58B30, but 30i badge not offered in the UK

Every engine fitted to the BMW Z4 30i is covered below, with UK rebuilt pricing and known failure points specific to each 3.0-litre straight-six generation.

Engine Codes & Pricing

BMW Z4 30i Engine Codes Specifications & Replacement Cost

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

M54B30 — 3.0L Straight-Six Petrol (2003-2005) engine

M54B30 — 3.0L Straight-Six Petrol (2003-2005)

Power Output
231hp (170kW) @ 5,900rpm
Torque
300Nm @ 3,500rpm
Displacement
2,979cc
Years Fitted
2003-2005 (E85 Z4 3.0i)
Engine Features
Aluminium block, dual-VANOS, DOHC 24-valve, multi-port fuel injection

Can’t find your exact engine code?-> Get quotes for M54B30 BMW Z4 30i engine replacement

-> Get quotes for M54B30 BMW Z4 30i engine replacement

Common Problems

BMW Z4 30i Engine Problems Repair Cost vs Replacement

The BMW Z4 30i's straight-six engines are among the most characterful powerplants BMW ever built, but age and mileage bring predictable issues. The M54B30 suffers from CCV and VANOS failures, while the N52B30 is plagued by electric water pump failures and oil leaks. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address these original failure points - plus a minimum 12-month unlimited mileage warranty.

Common failure points and repair options

Electric Water Pump Failure

Affected
BMW Z4 30i (E85 3.0si 2006-2008, E89 sDrive30i 2009-2016, N52B30)
Typical failure mileage
60,000-80,000 miles
Root cause
The N52's electric water pump is a known weak point - when it fails, the engine overheats within a mile, often with no prior warning. The pump can fail suddenly, leaving the driver stranded and risking a warped cylinder head.

Repair options

Repair tierDealer priceSpecialist price
Preventative - Water Pump Replacement£600-£900£350-£550
Full Replacement - rebuilt/reconditioned engine£4,500-£6,500£2,400-£3,800
Our recommendation
On any N52-powered Z4 30i approaching 60,000 miles, proactive electric water pump replacement is the single best investment you can make. A £350-£550 specialist preventative replacement is far cheaper than a warped cylinder head or full engine replacement. As one owner noted: "The only preventative job some people often do is to replace the electric water pump, because when (not if) it dies the engine overheats within a mile."
-> Compare rebuilt N52B30 engine prices for your BMW Z4 30i

CCV Failure

Affected
BMW Z4 30i (E85 3.0i 2003-2005, M54B30)
Typical failure mileage
70,000-110,000 miles
Root cause
The crankcase ventilation valve (CCV) diaphragm tears, allowing oil to be drawn into the intake manifold. Symptoms include excessive oil consumption (1L per 1,000 miles or more), blue smoke on start-up, and rough idle.

Repair options

Repair tierDealer priceSpecialist price
CCV Valve & Hose Replacement£500-£800£300-£500
Full Replacement - rebuilt/reconditioned engine£3,500-£5,000£2,200-£3,500
Our recommendation
CCV failure is one of the most common M54 issues and is relatively inexpensive to fix. At £300-£500 at a specialist, it's cheap insurance against catalytic converter damage. If you're seeing blue smoke on start-up but the car otherwise runs well, start with the CCV system before considering more expensive repairs.
-> Get quotes for BMW Z4 30i M54 CCV repair and replacement

N52 Oil Leaks

Affected
BMW Z4 30i (E85 3.0si 2006-2008, E89 sDrive30i 2009-2016, N52B30)
Typical failure mileage
50,000-90,000 miles
Root cause
The N52's valve cover gasket and oil filter housing gasket become brittle with age and heat cycling, leading to oil leaks. If left unchecked, leaks can cause oil to drip onto the exhaust manifold, creating a burning smell and potential fire risk.

Repair options

Repair tierDealer priceSpecialist price
Gasket Replacement£500-£800£300-£550
Full Replacement - rebuilt/reconditioned engine£4,500-£6,500£2,400-£3,800
Our recommendation
Oil leaks on the N52 are common but rarely catastrophic if addressed promptly. Check for oil around the valve cover and oil filter housing regularly. A £300-£550 specialist gasket replacement is cheap insurance against a more serious oil starvation issue.
-> Compare BMW Z4 30i N52 oil leak repair costs

Don't Let Engine Failure Write Off Your BMW Z4 30i

A failed M54 or N52 doesn't have to mean the end of the road for your Z4 30i. Whether you're facing CCV failure, electric water pump failure, or oil leaks, EnginesMarket connects you with trusted UK BMW straight-six specialists who supply rebuilt engines with upgraded components specifically designed to address the original failure points. Every engine comes with a minimum 12-month unlimited mileage warranty, nationwide delivery, and supply & fit options across the UK. Compare prices today - and keep one of BMW's most iconic roadsters on the road without paying the main dealer premium.

Compare BMW Z4 30i Engine Replacement Prices Now ->

FAQ

BMW Z4 30i Engine ReplacementFrequently Asked Questions

Everything BMW Z4 30i owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare BMW Z4 30i Engine Prices Today

Comparing quotes for your BMW Z4 30i is free, no-obligation, and specific to your exact roadster and its engine code - M54B30 or N52B30. Whether you need a used replacement, a reconditioned unit, or a full rebuilt engine with upgraded components, our network of trusted UK BMW straight-six specialists delivers transparent pricing and nationwide coverage. Don't let a failed engine end the life of one of BMW's most iconic roadsters - compare prices today and get back on the road with confidence.

11,000+11,000+ BMW Z4 engines supported through our network, including 30i variants
12-Month12-Month Warranty on every rebuilt M54B30 and N52B30 engine
NationwideNationwide UK delivery
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Compare quotes from trusted UK BMW Z4 30i engine specialists with warranty-backed rebuilt, reconditioned and used options nationwide.