What's the cost to replace an N52 engine in a 2008 Z4 3.0si?

Certified suppliers offer £4,200–£6,800 for low-mileage N52B30 units (<60k miles), including valvetronic motor and DISA, with 12-24 month warranty. Save 60% vs dealership quotes.

How do I know if my Z3's M54 engine needs replacing?

Classic warning signs include ticking from timing chain (guide rail failure), coolant in oil (cracked cylinder head), and blue smoke on overrun (valve stem seals).

Where can I find an S54 engine for my Z4 M Roadster?

Only 2 UK specialists stock S54B32 engines (£14,900+), complete with matching ECU and Inspection II service history.

What's the labor time for a Z1 M40 engine swap?

Specialist shops require 3-4 days for rare M40B18 swaps, with classic BMW certification needed and throttle cable recalibration included.

Should I rebuild or replace my Z8's S62 V8 engine?

Rebuild costs £28k+ with 2-year warranty and adds 15-20% resale value. Replacement costs £42k+ with 1-year warranty and maintains original matching numbers.

Why does my Z4 35i's N54 engine misfire?

Supplier-verified fixes include index 12 injector upgrade (£1,800+), coil pack replacement, and walnut blast carbon cleaning.

Can I swap a B58 into my E85 Z4?

Specialist conversions include custom engine mounts (£2,900+), ECU/DME integration, and modified exhaust routing, totaling £15,000-£20,000.

What documents come with a replacement Z3 engine?

Reputable suppliers provide BMW Classic certification, matching numbers verification, and heritage packages for rare models.

How to verify a used Z4 sDrive35is engine's condition?

Essential checks include wastegate rattle test, HPFP pressure readings, and turbo shaft play measurement.

What causes VANOS failure in Z4 2.5i models?

The M54B25's weak points include seal degradation (every 60k miles) and solenoid failures. Rebuilt units cost £680-£1,200.

Is the N20 in newer Z4s more reliable than the N52?

N20 offers turbo efficiency but has timing chain risks, N52 is naturally aspirated with longevity, and B58 (2019+) combines the best of both.

Do you offer finance on Z4 engine replacements?

Select classic specialists provide restoration loans, collector car financing, and agreed value insurance bundles.

What warranty comes with Z1 replacement engines?

Limited coverage includes 6-12 months on classic units, matching numbers guarantee, and spare parts support.

Why does my Z3 1.9L vibrate at 3,000 RPM?

Common fixes include engine mount replacement (£280-£420), guibo flex disc inspection, and driveshaft balancing.

How soon can I get an engine for my Z4 M40i?

Immediate UK stock includes 2 B58B30M1 engines (<20k miles), next-day delivery, and M Performance software.

BMW Z Series Engines - Used & Reconditioned

BMW Z Series Compatible Engine Codes & Average Prices on Rebuilt Units (UK Supply)

From £900 • N52/N55/B48 engines • 12m warranty • VAT-incl. • MoT-compliant

Fuel Type: Petrol

Engine Size: 2.2L

Compatible Models: Z3 2.2i, Z4 2.2i

Years: 2000–2005

AVG. PRICE: £1,400

The M54 B22 is a 2.2L naturally aspirated inline-6 engine used in entry-level Z3 and early Z4 models. This UK-rebuilt engine features a fully refreshed cylinder head, new timing chain, and updated valve seals. Known for its smooth power delivery and reliability, it's ideal for owners restoring a classic roadster. Rebuilt to OEM standards, it ensures full compatibility with 5-speed manual and automatic transmissions, offering a cost-effective, warranty-backed solution.

Fuel Type: Petrol

Engine Size: 2.5L

Compatible Models: Z3 2.5i, Z4 2.5i

Years: 2000–2005

AVG. PRICE: £1,670

The M54 B25 powers the mid-range Z3 2.5i and Z4 2.5i with refined performance and strong reliability. This reconditioned unit includes a machined block, new head gasket, and serviced throttle body. Designed for roadster fitment, it maintains full compatibility with factory electronics and drivetrain systems. A trusted choice for UK owners restoring a classic Z model with proven BMW engineering and long-term durability.

Fuel Type: Petrol

Engine Size: 3.0L

Compatible Models: Z3 3.0i, Z4 3.0i

Years: 2000–2005

AVG. PRICE: £1,170

The M54 B30 is a 3.0L inline-6 engine used in higher-spec Z3 and Z4 models. This UK-rebuilt engine includes a pressure-tested block, new VANOS units, and recalibrated DME for smooth cold starts. Rebuilt to OEM tolerances, it ensures full compatibility with both manual and automatic transmissions. A reliable upgrade for owners seeking a smooth, naturally aspirated driving experience in a warranty-backed package.

Fuel Type: Petrol

Engine Size: 3.2L

Compatible Models: Z3 3.2i (US-Spec)

Years: 1998–2002

AVG. PRICE: £1,440

The S52 B32 is the US-market version of the S50, used in the Z3 3.2i with individual throttle bodies and high-revving performance. This reconditioned engine includes a fully serviced head, new timing components, and updated intake system. Rebuilt to strict standards, it ensures full compatibility with factory ECU and drivetrain. A sought-after unit for Z3 restorers in the UK, this engine combines motorsport DNA with reliable rebuild quality.

Fuel Type: Petrol

Engine Size: 3.2L

Compatible Models: Z3 M, Z4 M

Years: 2000–2008

AVG. PRICE: £1,850

The S54 B32 is one of the last high-revving naturally aspirated BMW M engines, powering the Z3 M and Z4 M with up to 343hp. This UK-rebuilt engine includes a pressure-tested block, new valve seals, and fully overhauled VANOS units. Rebuilt to M Division standards, it ensures direct fitment and OEM-level performance. A top-tier choice for enthusiasts restoring a Z4 M roadster with authentic high-RPM character and track-ready reliability.

Fuel Type: Petrol

Engine Size: 4.9L

Compatible Models: Z8

Years: 2000–2003

AVG. PRICE: £1,870

The S62 B50 is the hand-built 4.9L V8 from the iconic Z8, delivering 400hp and a thunderous exhaust note. This UK-rebuilt engine includes updated rod bearings, revised throttle actuators, and a fully serviced valvetrain. Rebuilt to strict tolerances with new gaskets and oil pump, it's ideal for Z8 owners restoring a classic BMW masterpiece. Fully compatible with SMG transmission and factory electronics — a rare and premium-grade replacement.

Fuel Type: Petrol

Engine Size: 2.5L

Compatible Models: Z3 2.5i

Years: 1995–2000

AVG. PRICE: £1,270

The M52 B25 TU is an early 2.5L inline-6 engine used in pre-facelift Z3 2.5i models. This reconditioned unit includes a rebuilt block, new head gasket, and updated timing chain. Known for its durability and smooth power delivery, it's rebuilt to OEM specifications with full compatibility for 5-speed manual systems. A reliable, budget-friendly option for classic Z3 owners in the UK.

Fuel Type: Petrol

Engine Size: 2.0L

Compatible Models: Z4 2.0i (E85/E86)

Years: 2003–2008

AVG. PRICE: £900

The N46 B20 B is a 2.0L naturally aspirated petrol engine used in base Z4 2.0i models. This cost-effective rebuilt engine includes a new timing chain, updated gaskets, and refreshed valve train. Designed for direct replacement, it ensures full compatibility with factory ECU and drivetrain systems. A popular choice for budget-conscious UK owners, this engine offers reliable performance for everyday driving and city use.

Fuel Type: Petrol

Engine Size: 2.0L

Compatible Models: Z4 2.0i (E85/E86)

Years: 2006–2008

AVG. PRICE: £1,130

The N46 B20 A is a later-spec 2.0L inline-6 engine with improved emissions and reliability. This UK-rebuilt unit includes updated VANOS, revised cooling, and full OBD-II compliance. Designed for high-mileage replacements, it maintains full compatibility with automatic transmission and factory electronics. A refined and reliable choice for Z4 owners restoring a late-model roadster.

Fuel Type: Petrol

Engine Size: 2.5L

Compatible Models: Z4 2.5i, Z4 sDrive23i

Years: 2006–2008

AVG. PRICE: £1,530

The N52 B25 A is a smooth 2.5L inline-6 engine used in mid-range Z4 models. This reconditioned engine includes a fully refreshed block, new valve seals, and recalibrated DME for reliable cold starts. Rebuilt to OEM specifications, it ensures full compatibility with both manual and automatic transmissions. A trusted upgrade for owners seeking a reliable, warranty-backed replacement with classic BMW driving dynamics.

Fuel Type: Petrol

Engine Size: 2.5L

Compatible Models: Z4 2.5si

Years: 2006–2008

AVG. PRICE: £1,900

The N52 B25 AF is a tuned version of the 2.5L inline-6, used in the Z4 2.5si with enhanced throttle response and power delivery. This reconditioned engine features upgraded intake components and revised ECU mapping. Built for sporty performance, it ensures seamless integration with factory electronics. Rebuilt with OEM-spec parts and tested for durability, it's ideal for UK owners seeking a premium-grade roadster engine.

Fuel Type: Petrol / Flex-Fuel

Engine Size: 3.0L

Compatible Models: Z4 3.0si, Z4 sDrive30i

Years: 2006–2008

AVG. PRICE: £2,630

The N52 B30 A is a high-revving 3.0L inline-6 engine used in the Z4 3.0si and sDrive30i. This UK-rebuilt engine includes a pressure-tested block, new VANOS units, and recalibrated DME for smooth operation. Rebuilt to strict tolerances, it ensures full compatibility with 6-speed manual and automatic systems. A top choice for owners restoring a premium-spec Z4 with OEM-level performance and long-term reliability.

Fuel Type: Petrol

Engine Size: 3.0L

Compatible Models: Z4 sDrive35i, Z4 sDrive35is

Years: 2009–2016

AVG. PRICE: £4,580

The N54 B30 A is a twin-turbo 3.0L inline-6 engine used in the high-performance Z4 sDrive35i and sDrive35is. This UK-rebuilt engine includes a new high-pressure fuel system, updated turbochargers, and recalibrated DME. Rebuilt to M Division standards, it ensures full compatibility with factory electronics and sport suspension. A premium-grade replacement for enthusiasts seeking maximum power and track-ready reliability.

Fuel Type: Petrol / Flex-Fuel

Engine Size: 2.0L

Compatible Models: Z4 sDrive20i, sDrive28i

Years: 2009–2016

AVG. PRICE: £3,580

The N20 B20 A is a turbocharged 2.0L petrol engine used in the F30-based Z4 sDrive20i and sDrive28i. This reconditioned engine includes a new turbocharger, updated timing chain, and recalibrated DME for smooth throttle response. Known for its balance of performance and efficiency, it's rebuilt to OEM specs with full compatibility for 8-speed automatic systems. A trusted solution for owners needing a high-quality, warranty-backed replacement.

Fuel Type: Petrol

Engine Size: 2.5L

Compatible Models: Z4 sDrive25i

Years: 2009–2016

AVG. PRICE: £2,370

The N52 B25 is a late-spec 2.5L inline-6 engine used in the sDrive25i trim. This UK-rebuilt unit includes updated VANOS, revised cooling, and full OBD-II compliance. Rebuilt to OEM standards, it ensures seamless integration with factory electronics and drivetrain. Ideal for owners restoring a high-mileage Z4 with a reliable, warranty-backed inline-6 engine.

Fuel Type: Petrol

Engine Size: 2.0L

Compatible Models: Z4 sDrive20i, sDrive30i (G29)

Years: 2019–Present

AVG. PRICE: £3,100

The B48 B20 A is a modern 2.0L turbocharged petrol engine used in the G29 Z4 sDrive20i and sDrive30i. This UK-rebuilt engine includes a new turbocharger, updated timing chain, and recalibrated DME for smooth operation. Known for its reliability and efficiency, it's rebuilt to OEM specifications with full compatibility for 8-speed automatic and rear-wheel-drive systems. A popular choice for owners replacing a worn unit with a warranty-backed, drop-in replacement.

Fuel Type: Petrol

Engine Size: 3.0L

Compatible Models: Z4 M40i (G29)

Years: 2019–Present

AVG. PRICE: £6,200

The B58 B30 A powers the high-performance Z4 M40i with 382hp and sharp throttle response. This UK-rebuilt engine includes a new turbocharger, upgraded cooling, and recalibrated engine management. Known for its reliability and performance, it's rebuilt to strict tolerances with full compatibility for M Sport systems and factory electronics. A top-tier replacement for owners seeking a premium-grade, warranty-backed inline-6 engine.

Fuel Type: Petrol

Engine Size: 3.0L

Compatible Models: Z4 M40i (High-Output), Future M Models

Years: 2021–Present

AVG. PRICE: £6,500

The S58 B30 A is the motorsport-tuned version of the B58, used in high-output M40i and future M models. This reconditioned engine includes increased boost, reinforced internals, and enhanced cooling. Rebuilt to M Division standards, it ensures full compatibility with M xDrive and performance systems. Extremely rare in the rebuilt market — the ultimate upgrade for performance-focused Z4 owners.

BMW Z Series Engines for Sale | Engine Finders

Engine Finders is the UK's largest BMW engines marketplace for top-quality BMW replacement engines, including BMW Z Series engines - whether you're looking for a reconditioned, remanufactured, or low-mileage used engine. Simply enter your registration or browse our engine list to find a compatible match at highly competitive prices.

BMW Z Series Replacement Engines

The BMW Z Series is a line of roadsters and coupes that embody BMW’s commitment to driving pleasure and innovation. First introduced in 1989 (Z1), the Z Series has evolved through multiple generations, offering lightweight construction, powerful engines, and distinctive styling. The Z3 (1995–2002) became a global icon, while the Z8 (2000–2003) paid homage to BMW’s classic 507 roadster. The Z4 (2003–present) continues the legacy with modern technology and refined performance. With trims like the Z4 M40i and the rare Z8, the Z Series remains one of BMW’s most exciting sports car line-ups.

Whether you need a replacement due to timing chain issues, overheating, or general wear and tear, Engine Finders makes it easy to locate the right Z series engine, fast.

BMW Z Series Models & Engine Codes

BMW’s Z Series engines range from naturally aspirated inline-fours to high-performance V8s. Whether you're driving an early Z1 or a newer Z4 M40i, we can help you find the exact engine code match.

Here are some of the popular BMW Z Series engine codes we regularly stock:

BMW Z1 (E30/Z, 1989–1991)
Engine Code: M20B25
2.5L inline-six with 170 hp, featuring unique retractable doors.
BMW Z3 (E36/7, 1995–2002)
Engine Codes: M43B19, M44B19, M52B28, S52B32
Available in 4-cylinder and 6-cylinder variants, with up to 240 hp in the M Roadster.
BMW Z8 (E52, 2000–2003)
Engine Code: S62B50
5.0L V8 producing 400 hp, inspired by the classic BMW 507.
BMW Z4 (E85/E86, 2003–2008)
Engine Codes: M54B30, N52B30, S54B32
Offered in roadster and coupe variants, with up to 343 hp in the Z4 M.
BMW Z4 (E89, 2009–2016)
Engine Codes: N20B20, N52B30, N54B30
Turbocharged and naturally aspirated options, with up to 335 hp.
BMW Z4 (G29, 2018–Present)
Engine Codes: B48B20, B58B30
Modern roadster with turbocharged inline-four and inline-six engines, up to 382 hp in the M40i.
BMW Z Series Z1, Z3, Z4, Z8 (Body Styles)
Available in roadster and coupe variants across trims and generations.

We can also help source rare engine variants, including special editions like the Z3 M Coupé and models with performance-enhancing M upgrades. If you're unsure about compatibility, just send us your reg or VIN – we’ll do the hard work for you.

Buy Used and Second-Hand BMW Z Series Engines

Engine Finders connects you to a vast network of trusted UK suppliers with a wide range of BMW Z Series engines in stock. Whether you need:

Used Engines
Reconditioned Engines
Rebuilt Engines
Remanufactured Engines

Our vetted sellers ensure every BMW Z Series engine meets our quality standards, whether you’re after a budget-friendly used unit or a factory-spec remanufactured version.

BMW Z Series Engines in Stock

From everyday petrol to diesel-efficient or performance-driven models, we offer a wide-range of BMW Z Series used and reconditioned engines.

Reconditioned engines often include brand-new internal parts, such as:

New Pistons, Rings, Bearings, Gaskets, Chains, and Seals Precision-balanced components and multi-point quality checks
Every engine is tested for compression, leaks, and performance before dispatch.

Warranty for Replacement BMW Z Series Engines

All BMW Z Series replacement engines listed through Engine Finders come backed by supplier warranties for added peace of mind. Warranty periods include:

Reconditioned Engines: 6 months to 2 years
Used Engines: 30 days to 6 months
Remanufactured Engines: 1 to 2 years
International shipping available (from selected suppliers)

Please Note: "Warranty terms vary by engine type and supplier. We recommend inquiring directly with your chosen supplier for specific terms and conditions, as Engine Finders is a price comparison website."

Option	Cost	Warranty	Value Impact
Rebuild	£28k+	2yr	+15-20% resale
Replace	£42k+	1yr	Original matching #s

BMW Z Series Specialists

Expert Solutions for Every Z – Z2 2.2i to Z8 4.8

BMW Z Series Engines In Stock NOW: Live Prices, Rebuild Cost & Supply & Fit Service (UK-Wide)

Check REAL-TIME stock for Z3/Z4/Z8 (E36/E85/G29 chassis). View exact rebuild costs for M54/S58/M54 engines, professional engine works & certified garage near you – 12-month warranty, MoT-ready, same-day dispatch.

BMW Z Seris Replacement Engine Options - UK Supply

All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for Z1, Z3, Z4, Z8 chassis.

BMW Z Series Engine Finder: All Trims (Z1, Z3, Z4, Z8) | 2004-Present

Select your exact Z Series trim (Z1, Z3, Z4, Z8)→see confirmed engine codes chassis-specific variants, rebuild costs & UK stock with 12 months warranty

BMW Z3 (E36/7 Roadster, E36/8 Coupé; 1995–2002) – Please Select The Engine

BMW Z4 (E85/E86; 2002–2008) – Please Select The Engine

BMW Z4 (E89; 2009–2016) – Please Select The Engine

BMW Z4 (G29; 2018–present) – Please Select The Engine

BMW Z8 (E52; 2000–2003) – Please Select The Engine

BMW Z Series Compatible Engine Codes & Average Prices on Rebuilt Units (UK Supply)

From £900 • N52/N55/B48 engines • 12m warranty • VAT-incl. • MoT-compliant

Engine Code: M54 B22 (226S1)

Engine Code: M54 B25 (256S5)

Engine Code: M54 B30 (306S3)

Engine Code: S52 B32 (326S2)

Engine Code: S54 B32 (326S4)

Engine Code: S62 B50 (508S1)

Engine Code: M52 B25 TU

Engine Code: N46 B20 B

Engine Code: N46 B20 A

Engine Code: N52 B25 A

Engine Code: N52 B25 AF

Engine Code: N52 B30 A

Engine Code: N54 B30 A

Engine Code: N20 B20 A

Engine Code: N52 B25

Engine Code: B48 B20 A

Engine Code: B58 B30 A

Engine Code: S58 B30 A

Why Choose Engine Finders for Your BMW Z Series Engine?

✔ Trusted UK Suppliers

✔ Save Up to 60% vs Dealership

✔ Tested & Certified Engines

✔ Fast Quotes & Faster Delivery

✔ Expert BMW Z Series Support

✔ Engines for All BMW Z Series Models

✔ Performance Matched with Experience

✔ We Work for You - Not the Suppliers

Rated 4.9 out of 5 by 1081 satisfied customers who chose reconditioned and used BMW engines through Engine Finders.

BMW Z Series Engines for Sale | Engine Finders

BMW Z Series Replacement Engines

BMW Z Series Models & Engine Codes

Buy Used and Second-Hand BMW Z Series Engines

BMW Z Series Engines in Stock

Warranty for Replacement BMW Z Series Engines

Frequently Asked Questions - BMW Z Series Engines