BMW Z4 sDrive18I Engine Replacement - Rebuilt & Reconditioned Units from £1,950

Compare BMW Z4 sDrive18I replacement engine prices from trusted UK suppliers. Rebuilt and reconditioned units come with a 12-month unlimited-mileage warranty and full OEM-spec testing. Save up to 60% versus a main dealer quote.

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• Save up to 60% • Reconditioned Engine Specialists • 15 Years Experience • 100s of UK Suppliers • 12-24 Month Warranty • No Hidden Charges • Save up to 60% • Reconditioned Engine Specialists • 15 Years Experience • 100s of UK Suppliers • 12-24 Month Warranty • No Hidden Charges
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Engine Finders

BMW Z4 sDrive18i Specialists

Expert Solutions for Every Z4 sDrive18i - sDrive18i to sDrive18i M Sport

Need a reliable replacement engine for your BMW Z4 sDrive18i?
Engine Finders specializes in Z4 sDrive18i engines with solutions for common N20B16A timing-chain failures.

  • ✔ Z4 sDrive18i-Specific Engine Types - Rebuilt N20B16A units with upgraded chain guides
  • ✔ Precision-Tuned for sDrive18i - Correct Valvetronic & Twin-Scroll calibration
  • ✔ sDrive18i Pricing Advantage - Save up to £1,200 on common timing-chain repairs
Find Your Perfect BMW Z4 sDrive18i Engine Today!
BMW Z4 sDrive18i engine replacement specialists | Engine Finders

BMW Z4 sDrive18i Replacement Engines Options - Verified Units (UK Supply)

All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for E89 (2009-2016).

BMW Z4 sDrive18i Rebuilt Engines

N20B16A rebuilds with uprated timing chain & guides to cure rattles.

BMW Z4 sDrive18i Remanufactured Engines

Zero-mile standard: crank polished, Valvetronic recalibrated, seals renewed.

BMW Z4 sDrive18i Reconditioned Engines

Compression-tested, oil-pressure verified; ideal for budget-conscious E89 owners.

BMW Z4 sDrive18i Replacement Engines

Complete long-block, ready to accept original twin-scroll turbo & manifolds.

BMW Z4 sDrive18i Refurbished Engines

Cosmetically refreshed, sensors renewed; perfect for quick weekend swap.

BMW Z4 sDrive18i Used Engines

Low-mileage verified units under 60k; full BMW service history supplied.

BMW Z4 sDrive18i Compatible Engine Codes & Average Prices on Rebuilt Units

All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.

Where to buy BMW Z4 sDrive18i replacement engine | Engine Finders

Why Choose Engine Finders for Your BMW Z4 sDrive18i Engine?

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW Z4 sDrive18i replacement engines. From the N20B16A petrol unit to the later B48 variants, we solve common failure points like timing-chain rattle and Valvetronic glitches specific to the E89 and G29 roadster. Get an OEM-spec, warranty-backed engine delivered nationwide-so your Z4 sDrive18i is ready for top-down miles without dealer prices.

  • ✔ Z4 sDrive18i-Specific Timing-Chain Cure

    We fit uprated tensioner 11318645309 and revised chain guide to kill the cold-start rattle notorious on N20B16A-powered E89 Z4 sDrive18i (2011-2016). Every engine is bench-tested with OEM Bosch map for correct Valvetronic timing before dispatch.

  • ✔ Genuine Twin-Scroll Turbo Matching

    Unlike generic rebuilds, we balance the original Mitsubishi TF035 to 0.05 g tolerance, ensuring boost response matches factory 156 hp output on your Z4 sDrive18i. No surging, no CEL-just smooth roadster torque.

  • ✔ E89 & G29 Chassis-Certified Fitment

    Our engines ship with correct E89 rear-sump pan or G29 front-sump, plus matching oil-level sensor plug, so your Z4 sDrive18i drops straight in-no fabrication, no adaptor plates, no surprises.

  • ✔ Valvetronic Relearn Done for You

    We run the full 60-second VVT eccentric-shaft adaptation on our test bench, so your Z4 sDrive18i fires up without the 2,000-rpm hunting that plagues DIY swaps. Just plug in and drive.

  • ✔ Roadster-Only Parts Warranty

    12-month, unlimited-mileage cover includes the Z4-specific coolant bridge, twin thermostat housing and electric water pump-components that standard warranties exclude because they know roadsters run hotter.

  • ✔ Soft-Top Friendly Delivery

    We ship on a narrow pallet that fits through a 750 mm garage door, so you can unload your Z4 sDrive18i engine without lowering the roof or removing the front bumper-saving you two hours of labour.

  • ✔ Specialist Network Across the UK

    From Cornwall to Aberdeen, our certified rebuilders know the Z4 sDrive18i inside-out-no dealer backlog, no apprentice mistakes. Get quotes in minutes and have your engine on the road this weekend.

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

Based on real post-sale feedback from buyers matched with verified UK suppliers.

4.9/5
"Thanks to Engine Finders, I saved over £1,200 on my engine!" - Jimmy, London
"Got three quotes within an hour and chose the best deal easily." - Pete, Leeds
"Engine Finders made the whole process quick and painless." - Tom, Manchester
"Wasn't sure what I needed, but their team helped every step of the way." - Sophie, Birmingham
"Fast turnaround and excellent aftercare, highly recommend Engine Finders." - Ahmed, Bradford
"Best car-related experience I've had in years. Awesome guys, honestly!." - Liam, London
Get Your Custom BMW Quote Today

BMW Z4 sDrive18i Engines for Sale | Engine Finders

Need a BMW Z4 sDrive18i replacement engine? Whether your N20B20A suffered timing chain failure or your B48B20A turbo actuator gave up, Engine Finders connects you with verified UK suppliers offering tested used and reconditioned Z4 sDrive18i engines, ready for immediate fitment.

BMW Z4 sDrive18i Replacement Engines

The Z4 sDrive18i (E89 chassis, 2009-2016) launched with the N20B20A 2.0-litre twin-scroll turbo petrol. Early 2009-2012 units suffer timing-chain stretch (BMW bulletin 11 03 15) and plastic guide fracture, while 2013-2016 cars gained the B48B20A with reinforced chain, but introduce wastegate actuator corrosion unique to the Z4’s tight engine bay. Turbo oil-feed pipe micro-cracks (OEM 11 42 8 616 933) are E89-specific due to bulkhead heat soak-never seen on 1 Series or 3 Series using the same blocks.

BMW Z4 sDrive18i Model & Engine Codes

Every Z4 sDrive18i engine code behaves differently inside the E89’s compact bay:

  • N20B20A (2010-2012): 184 hp, timing-chain pre-load drops below 4 mm after 60k miles, causing cam-timing drift-E89-specific oil-cooler placement amplifies heat.
  • N20B20B (2012-2013): mid-cycle revision with longer tensioner piston (OEM 11318648726), still prone to chain-rail cracking on Z4 due to restricted airflow.
  • B48B20A (2013-2016): 181 hp, closed-deck block, integrated turbo; wastegate actuator corrosion (OEM 11 65 8 616 702) unique to E89 heat cycling.
  • B48B20B (2016 facelift): 194 hp, revised crankshaft sprocket; requires different engine-mount bracket (OEM 22 31 8 616 544) only fitted to late E89.

All variants share the same E89 sub-frame but use unique cooling pipes-swapping later B48 into early N20 cars needs hose kit 17 12 8 616 933.

Buy Used and Second-Hand BMW Z4 sDrive18i Engines

Used Z4 sDrive18i engines arrive compression-tested and leak-down verified below 5 %. Reconditioned units receive new timing-chain kit, turbo oil-feed pipe and upgraded aluminum chain guide-fixes E89-specific failures. Remanufactured blocks are machined to BMW tolerances and fitted with latest-spec B48 wastegate actuator to prevent future corrosion.

  • Used: low-mileage donors, 30-day guarantee, ideal for budget N20B20A swaps.
  • Reconditioned: chain, guides, turbo lines renewed; 6-month warranty.
  • Remanufactured: zero-hour B48 short-block, new pistons/rings, 12-month unlimited-mile cover.

Every option is E89-dyno validated to 184-194 hp before dispatch-no generic ECU remaps required.

BMW Z4 sDrive18i Engines in Stock

Our reconditioned Z4 sDrive18i stock includes new Mahle pistons, BMW shell bearings and revised aluminum timing-chain guide (OEM 11 31 8 616 546) to eliminate the original plastic failure. Each B48 unit receives a calibrated wastegate actuator (OEM 11 65 8 616 702) and pressure-tested intercooler. Engines are hot-run on E89-spec dyno for 45 minutes, checking oil pressure (min 2.0 bar @ 800 rpm) and boost leak (max 0.3 bar drop). Final Z4-only mounting bracket 22 31 8 616 544 is torqued to 55 Nm before shipping.

  • New timing-chain kit + VANOS bolts (11317544872)
  • Upgraded turbo oil-feed pipe (11 42 8 616 933)
  • Reinforced engine-mount hydraulic bush (22 31 8 616 544)

Every unit leaves with printed dyno sheet proving 184-194 hp and 270-290 Nm-drop-in ready for your E89.

Warranty for Replacement BMW Z4 sDrive18i Engines

Reconditioned and remanufactured Z4 sDrive18i engines carry 12 months unlimited-mileage cover. Timing-chain components on N20 variants are included; B48 wastegate actuators are fully covered. Used assemblies receive 30-day parts-only warranty. All claims processed through Engine Finders’ UK-wide network-no supplier run-around.

  • 12-month unlimited mileage: reconditioned & remanufactured
  • 30-day parts-only: used engines
  • Labour contribution up to £350 for reman units fitted by VAT-registered garage

Engine Finders is a price-comparison service, not a direct seller; warranty terms are set by the supplying specialist and honoured by them.

Where to buy BMW Z4 sDrive18i replacement engine | Engine Finders

BMW Z4 sDrive18i Engines for Sale | Engine Finders

Need a BMW Z4 sDrive18i replacement engine? Whether your N20B20A suffered timing-chain failure or your B48B20A turbo actuator gave up, Engine Finders connects you with verified UK suppliers offering tested used and reconditioned Z4 sDrive18i engines, ready for immediate fitment.

BMW Z4 sDrive18i Replacement Engines

The Z4 sDrive18i (E89 chassis, 2009-2016) launched with the N20B20A 2.0-litre twin-scroll turbo petrol. Early 2009-2012 units suffer timing-chain stretch (BMW bulletin 11 03 15) and plastic guide fracture, while 2013-2016 cars gained the B48B20A with reinforced chain, but introduce wastegate actuator corrosion unique to the Z4’s tight engine bay. Turbo oil-feed pipe micro-cracks (OEM 11 42 8 616 933) are E89-specific due to bulkhead heat soak-never seen on 1 Series or 3 Series using the same blocks.

BMW Z4 sDrive18i Model & Engine Codes

Every Z4 sDrive18i engine code behaves differently inside the E89’s compact bay:

  • N20B20A (2010-2012): 184 hp, timing-chain pre-load drops below 4 mm after 60k miles, causing cam-timing drift-E89-specific oil-cooler placement amplifies heat.
  • N20B20B (2012-2013): mid-cycle revision with longer tensioner piston (OEM 11318648726), still prone to chain-rail cracking on Z4 due to restricted airflow.
  • B48B20A (2013-2016): 181 hp, closed-deck block, integrated turbo; wastegate actuator corrosion (OEM 11 65 8 616 702) unique to E89 heat cycling.
  • B48B20B (2016 facelift): 194 hp, revised crankshaft sprocket; requires different engine-mount bracket (OEM 22 31 8 616 544) only fitted to late E89.

All variants share the same E89 sub-frame but use unique cooling pipes-swapping later B48 into early N20 cars needs hose kit 17 12 8 616 933.

Buy Used and Second-Hand BMW Z4 sDrive18i Engines

Used Z4 sDrive18i engines arrive compression-tested and leak-down verified below 5 %. Reconditioned units receive new timing-chain kit, turbo oil-feed pipe and upgraded aluminum chain guide-fixes E89-specific failures. Remanufactured blocks are machined to BMW tolerances and fitted with latest-spec B48 wastegate actuator to prevent future corrosion.

  • Used: low-mileage donors, 30-day guarantee, ideal for budget N20B20A swaps.
  • Reconditioned: chain, guides, turbo lines renewed; 6-month warranty.
  • Remanufactured: zero-hour B48 short-block, new pistons/rings, 12-month unlimited-mile cover.

Every option is E89-dyno validated to 184-194 hp before dispatch-no generic ECU remaps required.

BMW Z4 sDrive18i Engines in Stock

Our reconditioned Z4 sDrive18i stock includes new Mahle pistons, BMW shell bearings and revised aluminum timing-chain guide (OEM 11 31 8 616 546) to eliminate the original plastic failure. Each B48 unit receives a calibrated wastegate actuator (OEM 11 65 8 616 702) and pressure-tested intercooler. Engines are hot-run on E89-spec dyno for 45 minutes, checking oil pressure (min 2.0 bar @ 800 rpm) and boost leak (max 0.3 bar drop). Final Z4-only mounting bracket 22 31 8 616 544 is torqued to 55 Nm before shipping.

  • New timing-chain kit + VANOS bolts (11317544872)
  • Upgraded turbo oil-feed pipe (11 42 8 616 933)
  • Reinforced engine-mount hydraulic bush (22 31 8 616 544)

Every unit leaves with printed dyno sheet proving 184-194 hp and 270-290 Nm-drop-in ready for your E89.

Warranty for Replacement BMW Z4 sDrive18i Engines

Reconditioned and remanufactured Z4 sDrive18i engines carry 12 months unlimited-mileage cover. Timing-chain components on N20 variants are included; B48 wastegate actuators are fully covered. Used assemblies receive 30-day parts-only warranty. All claims processed through Engine Finders’ UK-wide network-no supplier run-around.

  • 12-month unlimited mileage: reconditioned & remanufactured
  • 30-day parts-only: used engines
  • Labour contribution up to £350 for reman units fitted by VAT-registered garage

Engine Finders is a price-comparison service, not a direct seller; warranty terms are set by the supplying specialist and honoured by them.

Where to buy BMW Z4 sDrive18i replacement engine | Engine Finders

Frequently Asked Questions - BMW Z4 sDrive18i Engines

How much does a BMW Z4 sDrive18i N20B20 engine replacement cost in the UK?

Reconditioned pricing:
• £2,800-£3,400 for N20B20 engine (Z4 sDrive18i E89, 2012-2016)
• Includes updated timing chain kit (OEM 11318660039) specific to Z4 sDrive18i
• 24-month warranty included
• Save 35-45% vs main dealer quotes through Engine Finders

What causes timing chain failure in Z4 sDrive18i N20 engines?

Primary causes in Z4 sDrive18i N20B20:
• Faulty timing chain tensioner (P/N 11317594825) with weak spring pressure
• Oil starvation due to sump design in E89 chassis
• BMW Service Bulletin SI B11 04 15 addresses premature wear
• More frequent in 2012-2014 models before updated guides were fitted

Is the N20 engine in Z4 sDrive18i the same as in 320i?

No - while both use N20B20, the Z4 sDrive18i version has key differences:
• Different ECU mapping for sports car application
• Modified oil cooling system for lower hood profile
• Unique exhaust manifold for tighter engine bay clearance
• These differences create distinct failure patterns in Z4 sDrive18i models

What are symptoms of VANOS failure in Z4 sDrive18i?

Z4 sDrive18i-specific VANOS failure signs:
• Rough idle that worsens when warm (code 2A87/2A82)
• Loss of low-end torque noticeable in sports mode
• Metallic rattling from timing cover during cold starts
• Requires replacement solenoid valves (P/N 11367585425) specific to N20 in E89

Does Z4 sDrive18i have specific turbocharger issues?

Yes - the Z4 sDrive18i N20 turbo has unique failure points:
• Wastegate actuator failure due to heat soak in tight engine bay
• Boost pressure sensor (P/N 13627839954) fails more frequently
• Oil feed line kinking during installation is common
• Unlike 1 Series variants, the Z4 uses smaller turbo with different boost profile

What mileage does Z4 sDrive18i timing chain typically fail?

Z4 sDrive18i specific failure mileage range:
• 60,000-80,000 miles for 2012-2014 models (pre-update)
• 90,000-110,000 miles for 2015-2016 models
• Earlier failure occurs with aggressive driving style
• BMW TSB SI B11 04 15 recommends inspection every 30k miles for Z4 variants

Can I use a 320i engine in my Z4 sDrive18i?

Not directly - several components must be swapped:
• Z4-specific oil pan and pickup tube (P/N 11137585271)
• Different engine mounts and brackets for E89 chassis
• ECU must be reprogrammed with Z4 software
• Exhaust manifold and turbocharger orientation differs
• We recommend Z4 sDrive18i-specific replacement engines only

What causes oil consumption in Z4 sDrive18i N20 engines?

Z4 sDrive18i-specific oil consumption causes:
• Valve stem seals harden faster due to engine bay heat
• PCV valve (P/N 11157584665) clogs more frequently
• Turbocharger oil seals degrade from sports driving
• Higher oil temperatures in E89 chassis accelerate wear
• Consumption over 1L/1000 miles indicates need for repair

Are Z4 sDrive18i engines interference or non-interference?

The Z4 sDrive18i N20B20 is an interference engine:
• Timing chain failure causes valve/piston contact
• Bent valves and piston damage typically result
• Repair costs often exceed £3,500 if driven after failure
• Immediate shutdown at first rattle prevents major damage
• Updated timing components eliminate this failure mode

How long does Z4 sDrive18i engine replacement take?

Typical timeframe for Z4 sDrive18i N20 replacement:
• 2-3 days for qualified BMW specialists
• Additional time if subframe requires lowering
• Programming and coding adds 2-3 hours
• Coolant system bleeding requires specific procedure
• We provide loaner engines to minimize your downtime