BMW Z4 35i (E89) engine: which one, problems and replacement

The BMW Z4 35i in the second Z4 generation (E89, built 2009–2016) was built with one engine, the N54B30: a 3.0 L petrol inline-6 with 306 hp.

This guide tells you which engine your Z4 35i has, what goes wrong with it, what a replacement costs from our stock and what else to plan for when you fit one.

• Generation: second Z4, 2009–2016
• Body styles: E89 (folding hard-top roadster)
• Engines: N54B30
• Output: 306 hp
• Replacement engines in stock: 221 from 2.382,00 €

Which engine is in your Z4 35i?

N54B30 in the Z4 35i

The N54B30 was used in the E89 Z4 35i, built 2006–2016. It is a 3.0 L twin-turbo petrol inline-6 with 306 hp and 400 Nm.

Reading the code: N marks an N-series code, the generation of BMW engines introduced from 2001; 54 is the family number; B stands for petrol (from the German Benzin); 30 is the capacity in decilitres, so 3.0 litres.

Z4 35i engines by model year

The Z4 35i kept the same engine for the whole E89 run, which makes ordering simple: any unit with the same code fits, subject to the gearbox, drive type and sump.

Other cars with the same engine as the Z4 35i

A replacement engine does not have to come from another Z4 35i. These models left the factory with the same engine code, so a unit from any of them is a candidate donor once the sump, mounts and ancillaries are matched to your car.

N54B30: BMW E90 335i, BMW E92 335i, BMW E82 135i, BMW E60 535i.

How to confirm your engine code

The Z4 35i only used the N54B30, but the exact version can still change with the build date, gearbox and market. Send us the last seven characters of the VIN and we read the engine code from BMW's records, or look for the code stamped on the block. How to find your BMW engine code.

Known Z4 35i engine problems

The N54B30 in the Z4 35i shares the known weak points of the N54 family. Full N54 guide.

High-pressure fuel pump. Early HPFPs failed, causing long starts and limp mode. Updated pumps fixed most issues.

Wastegate rattle. Turbo wastegate arms wear and rattle; turbos can also leak oil.

Piezo injectors. Injectors can leak; updated revisions are more reliable.

Electric water pump. The pump fails around 100,000 km.

Charge pipe and oil leaks. The plastic charge pipe cracks; oil filter housing and valve cover gaskets leak.

Carbon build-up. Intake valves carbon up and need walnut blasting.

Symptoms to watch for on the Z4 35i

Rattle for a few seconds after a cold start. The classic sign of a weak timing chain tensioner or stretched chain. It must be checked quickly: a chain that jumps a tooth can bend valves.

Whistle, loss of boost or limp mode. A split charge pipe, a sticking wastegate or worn turbo bearings. Check the pipes first, then the turbo shaft for play.

Poor low-down torque and uneven idle. VANOS seals or solenoids. The engine may run well at high revs but feel flat and lumpy at low speed.

Long cranking before the engine starts. On direct-injection engines, a weak high-pressure fuel pump or leaking injector lets pressure drop when the engine is off.

Looking after the Z4 35i engine

• Oil: 5W-30 BMW Longlife-01, about 6.5 litres.
• Service interval: Oil every 10,000 km; plugs every 40,000 km.
• Timing drive: Timing chain at the front.
• Workshop notes: Fit new plugs, check injectors and confirm the HPFP revision before installing.

Buying a used engine for the Z4 35i: checklist

1. Warranty terms in writing. Read what the warranty covers, how long it runs and what fitting conditions apply. Most warranties require a qualified workshop, new fluids and filters, and replacement of the cooling parts that caused the original failure.
2. Sump, oil pickup and drive variants. Rear-drive, xDrive and front-drive cars can use different sumps, oil pickups and engine mounts even with the same engine code. Check that the sump matches your subframe and front axle.
3. Photographs from every side. Good suppliers photograph the actual engine you will receive. Look for the block stamp, the sump, the timing cover and any broken brackets or connectors in the pictures.
4. Gearbox and flywheel match. Manual and automatic engines differ at the flywheel or flexplate, and sometimes at the crankshaft spigot. Make sure the engine you buy matches your gearbox or that you transfer the right parts.
5. Confirm the exact engine code. Read the code stamped on the block and compare it with the code for your car. Send us the last seven characters of the VIN and we confirm the match before anything is paid.
6. Turbocharger shaft play and oil. Rotate the compressor wheel by hand. A small amount of side play is normal; in-and-out play or wheel contact with the housing is not. Oil pooled in the intake or intercooler pipes points to worn seals.
7. Timing chain noise. Listen for a rattle at the front of the engine for the first seconds after a cold start. On an engine that cannot be run, look at the chain guides through the oil filler or with the valve cover off.
8. VANOS operation. Rough idle, a rattle from the front of the head and a loss of torque at low revs point to VANOS seals or solenoids. These are serviceable parts and are easier to renew with the engine out.
9. Double VANOS units and solenoids. Ask for the adaptation values or fault history if the engine was running. Solenoids are inexpensive and are often replaced as a matter of course on a used engine.
10. Injectors and high-pressure fuel pump. Direct-injection engines rely on high-pressure pumps and precise injectors. Ask whether the injectors are original or updated and whether there were fuel pressure faults.
11. Electric water pump. This engine uses an electric water pump. It fails without warning and needs a diagnostic bleeding routine when it is replaced or the system is refilled.

BMW Z4 35i replacement engine cost

Across 221 Z4 35i engine units in our stock today, prices start at 2.382,00 € and reach 5.821,00 €. The median — the price in the middle of the range — is 3.607,00 €.

Prices depend on the exact version, the donor's mileage, how complete the engine is and the demand for that code. Higher-output versions, low mileage and dressed engines with turbo, injectors and ancillaries cost more; long blocks and higher mileage cost less.

Z4 35i engine prices by model year

Engines from 2000–2004 have a median of 5.659,00 €, while units from 2015–2019 sit at 3.380,00 €. Newer engines usually cost more because they come from younger donor cars with lower mileage and later updates.

Z4 35i engine prices by mileage

Mileage matters less than history on a well-maintained BMW engine, but it is a useful guide. A low-mileage unit from a younger car gives you more life for a modest premium.

3 of these come from E89 donor cars, priced from 2.382,00 € to 5.013,00 €. An engine from the same body is the most direct swap because the sump, mounts and ancillaries already match.

On top of the engine, budget for the workshop's labour and the parts that are best replaced while the engine is out: engine mounts, the rear main seal, cooling parts, a clutch or converter seal, fluids and filters.

Replacement engines in stock for the Z4 35i

These Z4 35i units are in our Hamburg yard right now. Each listing shows real photographs of the engine you receive, its mileage and what is fitted.

BMW E92 335i N54B30 Engine 2009, 126,200 km3.358,00 €BMW E90 335i N54B30 Engine 2007, 131,800 km3.036,00 €BMW E92 335i N54B30 Engine 2009, 109,100 km3.622,00 €BMW E82 135i N54B30 Engine 2008, 92,000 km4.184,00 €BMW E82 135i N54B30 Engine 2006, 201,700 km4.131,00 €BMW E60 535i N54B30 Engine 2010, 148,100 km3.176,00 €BMW E90 335i N54B30 Engine 2009, 104,300 km2.971,00 €BMW E90 335i N54B30 Engine 2009, 140,800 km4.176,00 €BMW E82 135i N54B30 Engine 2008, 132,200 km3.015,00 €BMW E92 335i N54B30 Engine 2007, 124,400 km3.745,00 €BMW E90 335i N54B30 Engine 2006, 201,300 km3.717,00 €BMW E92 335i N54B30 Engine 2007, 73,600 km3.275,00 €

BMW E92 335i N54B30 Engine 2009, 126,200 km — 3.358,00 €, reduced from 4.050,00 €. It comes from a 2009 donor car with 126,200 km, and 22 units are available. We can confirm fitment against your VIN the same day.

BMW E90 335i N54B30 Engine 2007, 131,800 km — 3.036,00 €, reduced from 4.400,00 €. It comes from a 2007 donor car with 131,800 km, and 30 units are available. We can confirm fitment against your VIN the same day.

BMW E92 335i N54B30 Engine 2009, 109,100 km — 3.622,00 €, reduced from 4.400,00 €. It comes from a 2009 donor car with 109,100 km, and 6 units are available. We can confirm fitment against your VIN the same day.

BMW E82 135i N54B30 Engine 2008, 92,000 km — 4.184,00 €, reduced from 5.050,00 €. It comes from a 2008 donor car with 92,000 km, and 30 units are available. The listing shows every side of the engine and the fitted parts.

BMW E82 135i N54B30 Engine 2006, 201,700 km — 4.131,00 €, reduced from 5.500,00 €. It comes from a 2006 donor car with 201,700 km, and 21 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW E60 535i N54B30 Engine 2010, 148,100 km — 3.176,00 €, reduced from 4.050,00 €. It comes from a 2010 donor car with 148,100 km, and 28 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW E90 335i N54B30 Engine 2009, 104,300 km — 2.971,00 €, reduced from 3.650,00 €. It comes from a 2009 donor car with 104,300 km, and 28 units are available. The listing shows every side of the engine and the fitted parts.

BMW E90 335i N54B30 Engine 2009, 140,800 km — 4.176,00 €, reduced from 4.950,00 €. It comes from a 2009 donor car with 140,800 km, and 17 units are available. The listing shows every side of the engine and the fitted parts.

BMW E82 135i N54B30 Engine 2008, 132,200 km — 3.015,00 €, reduced from 3.950,00 €. It comes from a 2008 donor car with 132,200 km, and 22 units are available. We can confirm fitment against your VIN the same day.

BMW E92 335i N54B30 Engine 2007, 124,400 km — 3.745,00 €, reduced from 4.500,00 €. It comes from a 2007 donor car with 124,400 km, and 6 units are available. The listing shows every side of the engine and the fitted parts.

BMW E90 335i N54B30 Engine 2006, 201,300 km — 3.717,00 €, reduced from 5.050,00 €. It comes from a 2006 donor car with 201,300 km, and 11 units are available. We can confirm fitment against your VIN the same day.

BMW E92 335i N54B30 Engine 2007, 73,600 km — 3.275,00 €, reduced from 4.250,00 €. It comes from a 2007 donor car with 73,600 km, and 13 units are available. We can confirm fitment against your VIN the same day.

Will it fit my Z4 35i?

Will the N54B30 fit my BMW E89 Z4 35i?

For the BMW E89 Z4 35i, the N54B30 is the factory engine and the one to order. The second Z4 was built 2009–2016, and the N54B30 was produced 2006–2016, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.

How much is a replacement engine for a BMW E89 Z4 35i?

We have 3 N54B30 engines from E89 donor cars, priced from 2.382,00 € to 5.013,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.

Fitting a replacement engine in the Z4 35i

1. Inspect or replace the timing chain parts. Look at the guides and tensioner. On high-mileage engines, replacing them now costs far less than doing it later.
2. Prepare the turbo. Fit new oil feed and return seals, clean the intercooler and pipes of any oil or debris from the old engine, and prime the turbo with oil before starting.
3. Reset VANOS adaptations. Clear the VANOS adaptations so the ECU learns the camshaft positions of the new engine.
4. Fill with the right oil and prime it. Fill with new oil of the correct specification and a new filter. Crank with the fuel and ignition disabled until oil pressure builds.
5. Coding and adaptations. On modern BMWs, the engine ECU must be matched to the car's immobiliser (CAS, FEM or BDC). Reset adaptations, register the battery and clear faults with diagnostic software.
6. First start and leak check. Start the engine, let it idle and watch oil pressure, temperature and fault codes. Check for leaks and bleed the cooling system.
7. First 1,000 km. Drive gently for the first few hundred kilometres, vary the engine speed and avoid full load. Change the oil and filter after about 1,000 km to remove any assembly debris.

The full fitting and first-start procedure.

Delivery, warranty and payment

Before a Z4 35i engine leaves our Hamburg yard it is drained of oil and coolant, every opening is sealed, and it is strapped to a pallet and wrapped. We send photographs of the packed unit and the tracking details.

Door-to-door delivery is included to the address you give at checkout. Typical delivery takes three to five working days within Germany and neighbouring countries and five to ten working days to the rest of Europe and the UK.

Every engine carries a 12-month warranty on eligible internal failure when a qualified workshop fits it with new fluids and filters. Payment is by card, bank transfer or crypto; your invoice is emailed as soon as you order.

All E89 engines · N54 engine guide · Send us your VIN