BMW Z4 30i Engine ReplacementCompare 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.
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12-Month Warranty
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From Six - from £1,495 to £3,800
Used from £1,100 · Reconditioned from £1,800 · Common codes: M54B30, N52B30, N52B30O1
From £1,100
Tested, bare/short engine
From £1,800
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 Z4 30i Replacement Engineto Finding the Best BMW Z4 30i Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 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.
Variant HistoryBMW 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
Fuel TypePetrol (naturally aspirated)
Engine Size3.0L (2,979-2,996cc)
Power Output Range231-265hp across the variant's historyEngine History Timeline
E85 Z4 3.0i launched with M54B30 231hp, 300Nm, dual-VANOS
E85 facelift 3.0i replaced by 3.0si with N52B30, 265hp, Valvetronic
2008 - Z4 M (S54) and 3.0si (N52) produced alongside each other
E89 Z4 sDrive30i launched with N52B30 258hp, 310Nm, retractable hardtop
End of E89 production; Z4 30i badge discontinued until G29 M40i
present - G29 Z4 M40i uses B58B30 but 30i badge not offered in the UK
Key Specs Snapshot
Fuel TypePetrol (naturally aspirated)Engine Size3.0L (2,979-2,996cc)Power Output Range231-265hp across the variant's historyYears Produced2003-2016Every 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.
BMW Z4 30i Engine Codes - Specifications & Replacement CostBMW Z4 30i Engine Codes - Specifications & Replacement Cost
3.0L Straight-Six Petrol (2003-2005)
Power Output231hp (170kW) @ 5,900rpmTorque300Nm @ 3,500rpmDisplacement2,979ccYears Fitted2003-2005 (E85 Z4 3.0i)Engine FeaturesAluminium block, dual-VANOS, DOHC 24-valve, multi-port fuel injection
Compatible Trim Levels
- 3.0i
- 3.0i Sport
- 3.0i SE
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,100-£1,600
Reconditioned
Addressed known issues, tested
£1,800-£2,800
Rebuilt
Full teardown, upgraded internals
£2,200-£3,500
Common Failure
CCV (crankcase ventilation) valve failure causing oil consumption, VANOS seal degradation, cooling system weaknesses (expansion tank, water pump, thermostat).
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.
Why the BMW Z4 30i N52 Engine Overheats
Affected Vehicles
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.
Why It Happens
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.
Dealer (parts + labour)
£600-£900
Specialist (parts + labour)
£350-£550
What it involves
Replace electric water pump and thermostat, coolant flush
Suitability
Recommended proactively at 60k-70k miles
1 - 2 daysDealer (parts + labour)
£4,500-£6,500
Specialist (parts + labour)
£2,400-£3,800
What it involves
Supply & fit rebuilt N52B30 with new water pump, 12-month warranty
Suitability
Required if overheating caused head gasket or cylinder head 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 |
|---|---|---|---|---|---|
 Preventative - Water Pump Replacement Minor | £600-£900 | £350-£550 | Replace electric water pump and thermostat, coolant flush | Recommended proactively at 60k-70k miles | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £4,500-£6,500 | £2,400-£3,800 | Supply & fit rebuilt N52B30 with new water pump, 12-month warranty | Required if overheating caused head gasket or cylinder head damage | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical BMW Z4 30i is worth £5,000-£15,000 depending on generation, mileage, and condition (`[THIRD-PARTY]` - Auto Trader market observation). Given the vehicle's enthusiast appeal and rising classic car values, engine replacement is generally viable for well-maintained examples. For higher-mileage examples with other wear issues, evaluate the vehicle's overall condition before committing.
Our Recommendation
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."
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 rebuilt N52B30 engine prices for your BMW Z4 30i
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 Z4 30i. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW Z4 30i Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW Z4 30i engine replacement cost in the UK-
A BMW Z4 30i engine replacement typically costs £1,495-£3,800 supply-only for rebuilt units, or £2,800-£5,500 fitted by a specialist.
- Used M54B30 engines: £1,100-£1,600 supply-only
- Used N52B30 engines: £1,200-£1,800 supply-only
- Reconditioned N52B30 units: £2,000-£2,800 supply-only
- Rebuilt M54B30 units: £2,200-£3,500 supply-only
- Professional fitting adds £800-£1,500 depending on workshop location
Question 2Which engine does the BMW Z4 30i have - M54 or N52-
The Z4 30i badge spans two engine families depending on the generation:
- E85 Z4 3.0i (2003-2005): M54B30, 231hp, dual-VANOS
- E85 Z4 3.0si (2006-2008): N52B30, 265hp, Valvetronic
- E89 Z4 sDrive30i (2009-2016): N52B30, 258hp, Valvetronic
- The N52 is BMW's final naturally aspirated straight-six - more powerful and efficient but with electric water pump and oil leak concerns
Question 3Is the BMW Z4 30i N52 engine reliable-
The N52B30 is generally considered robust and "pretty bulletproof" by owners, but it has known weaknesses:
- Electric water pump failure is common between 60k-80k miles - replace preventatively
- Valve cover and oil filter housing gaskets leak as they age
- Eccentric shaft sensor can fail, causing rough idle
- Timing chain is durable - rarely fails before 180k miles
- Regular oil changes with BMW LL-01 approved oil are essential
Question 4What are the signs of water pump failure in a BMW Z4 30i-
The N52's electric water pump can fail suddenly with little warning:
- Overheating within a mile of failure
- No prior warning signs in many cases
- Coolant loss without visible external leaks
- Electric water pump failure is more common than mechanical pump failure on N52 engines
- Proactive replacement at 60k-70k miles is strongly recommended
Question 5Is it worth replacing the engine on a high-mileage BMW Z4 30i-
For a Z4 30i worth £5,000-£15,000, a rebuilt engine at £2,200-£3,800 can make financial sense if the body, interior, and chassis are in good condition.
- Compare replacement cost against vehicle value - replacement is viable up to 70% of car's value
- Early E85 3.0i and low-mileage E89 sDrive30i examples command higher values
- Classic car values are rising - a well-maintained Z4 30i is a sound investment
- Always factor 12-month warranty into replacement decision
Question 6What's the difference between the Z4 30i and the Z4 35i-
The key differences between the Z4 30i and 35i are significant:
- 30i uses naturally aspirated N52B30, 255-265hp - simpler, more reliable
- 35i uses turbocharged N54B30, 302hp - more power but HPFP and turbo failures common
- 30i rebuilds are cheaper: £2,000-£2,800 vs £3,000+ for 35i
- 30i avoids the turbo-related failures that plague the 35i
- For long-term reliability, the 30i is often the better choice
Why Choose UsCompare BMW Z4 30iEngine PricesToday
11,000+ BMW Z4 engines supported through our network, including 30i variants
12-Month Warranty on every rebuilt M54B30 and N52B30 engine
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supply & fit available
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.
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