The BMW Z4 is a performance roadster that has a reputation for its strong engines and engaging drive. When this beast loses its engine power, buying a brand new engine from the main dealer can cost more than the value of the whole car. BM Engine Works offers a practical solution for this. We supply and fit quality reconditioned and used BMW Z4 engines that match factory specifications. Our specialists rebuild each unit in-house, test it thoroughly and back it with a warranty for peace of mind. Customers benefit from up to 40% discount savings on a new engine and our fast turnaround time, so you get back on the road quickly. It doesn't matter whether you drive a 2.0-litre E89 or a 3.0-litre M40i; we have all the right engines for your BMW Z4.
Every used engine we sell comes from a low-mileage donor vehicle. Our technicians strip it down, inspect each cylinder, pressure test the heads and replace worn parts before reassembly to ensure it is in perfect working order. For drivers who prefer a reconditioned engine, we follow a similar process but rebuild the unit with new internal components so it performs like new. We handle engine supply and fit at our workshop and can also deliver engines to your desired location. With in-house expertise, a vehicle recovery service and a comprehensive stock, our team makes BMW Z4 engine replacement simple and affordable.
BMW offers several petrol engines for the Z4, with power outputs and configurations evolving over the roadster’s generations. Early Z4 models (E85/E86, 2002-2008), including the popular 2007 model, used naturally aspirated inline six engines such as the 2.5i N52B25A and the 3.0 litre N52B30A. These 6-cylinder engines deliver smooth power and remain popular among enthusiasts because of their reliability. The E85 Z4 M used a 3.2 litre six cylinder producing about 330 hp, while standard 3.0 litre engines offered between 215 hp and 302 hp.
The second-generation Z4 (E89, 2009 -2016) introduced turbocharging. Entry-level sDrive20i and 28i models use a 2.0 L four-cylinder N20B20A engine, delivering a spirited drive while maintaining efficiency. The sDrive30i features a 2.5 litre six cylinder, and performance-oriented models from 2012 onwards, such as the sDrive35is, run a turbocharged 3.0 litre N54B30 engine generating up to 264 hp. In the latest G29 Z4 (2018-present), the sDrive30i continues with a turbocharged 2.0 litre B48 engine, while the M40i variant adopts a 3.0 litre B58 inline six producing 335 hp and 500 Nm of torque.
No engine is perfect, and some Z4 powerplants have known weak points. Owners of first-generation Z4 often report misfires caused by worn DISA valves or faulty VANOS solenoids. The N52 engine found in many Z4 has its own common issues. VANOS failure, hydraulic valve lifter ticking, water pump failure, thermostat failure, valve cover leaks and oil filter housing gasket leaks as the most frequent problems. These faults can cause poor idling, overheating, coolant leaks and oil consumption, often preceded by a warning light on the dashboard. Electric water pumps can fail around 60k miles, and thermostats may stick open or closed, leading to temperature fluctuations. In addition, Z4 owners sometimes experience misfire or rough running due to coil or spark plug issues. Our workshop can check these problems and advise whether a used engine or reconditioned unit will restore performance.
BMW uses specific codes to identify its engines, and knowing your engine code helps ensure you get the correct replacement. Our inventory covers all of these engine codes and more. We source low-mileage used BMW Z4 car engines from scrap yards and damaged vehicles, test them for compression, oil pressure and coolant integrity and make them available at the best prices. For drivers seeking like-new performance, our reconditioned and refurbished engines are stripped to the bare cylinder block, cleaned, honed and rebuilt using brand new internal parts. Our expert reconditioners ensure each rebuild includes new timing components and a complete coolant flush to prevent future overheating. The result is a reconditioned engine that delivers factory performance, is fully guaranteed and backed by our up to 24 months warranty.
When you are looking for a BMW Z4 engine, our team will help you identify the correct code and recommend the best replacement engine option based on your budget and needs. If you are thinking, 'Where can I find an engine for my BMW?', our team will help you. We can supply and fit the engine in our workshop, or simply supply it for your mechanic to install. Our delivery service covers the UK, and we can even collect your vehicle for a complete engine replacement. If your existing engine has seen better days or you want to change the engine to a different capacity, we can advise whether a swap is feasible and handle the paperwork. We also offer quality BMW Z4 car parts such as alternators, turbochargers, cylinder heads and gearboxes to support any rebuild project.
The cost of replacing a BMW Z4 engine depends on the model year, engine type and extent of damage. Buying a brand new engine from BMW can exceed the car’s market value, especially on older Z4. Choosing a high quality used or reconditioned engine can save up to 40% compared with a new unit, giving you the cheapest price. We provide price quotes based on your vehicle’s registration and the engine code required, and we never surprise customers with hidden costs, ensuring you get the cheapest online prices. To ensure reliability, we recommend using a fully synthetic 5W 30 engine oil that meets BMW’s Long-life 01 specification.
Many specialists regard the naturally aspirated M54 six-cylinder used in early E85/E86 Z4 models as one of BMW’s most reliable engines and potentially the best engine for purists. However, the later B58 3.0 litre turbo engine in the Z4 M40i delivers more power and modern efficiency.
While every model can deliver years of service when maintained, early E85 Z4 (2003 -2005) are now two decades old and may suffer from age-related issues such as roof motor failure, leaking cooling systems and worn suspension.
A used engine is removed from a donor car and sold as a complete unit after inspection and testing. Mileage and wear vary, but a low-mileage used engine can be a cost-effective replacement. A reconditioned engine is stripped down by specialist engine suppliers, cleaned and rebuilt with new internal parts and critical machining.
Rebuilding a replacement BMW Z4 engine involves machining the block, replacing pistons, bearings, gaskets and timing components and can cost between £2,000 and £8,000+, depending on the extent of damage.
Turnaround times vary with the complexity of the job and parts availability, typically around 5-10 working days.
A low-mileage used engine can be the ideal engine, as it offers a quick and affordable way to get your Z4 back on the road, often being the cheapest option.
Persistent misfire often indicates internal engine damage or failures like worn VANOS solenoids, valve issues or piston ring wear. Installing a healthy used engine can resolve the misfire, and you can buy your engine from us when repairs are uneconomic.
We offer reconditioned 2.0 litre four cylinder engines, 2.5 litre N52 series engine and 3.0 litre engines including N52B30, N54 and B58 codes. We also supply quality ancillaries such as turbochargers, cylinder heads and injectors to ensure the entire engine bay functions properly.
Smoke or steam from the engine can indicate an oil leak burning on a hot exhaust, coolant leaking from a failed expansion tank or water pump, or more serious issues like head gasket failure.
Yes. We offer a vehicle recovery service to bring your Z4 to our workshop for diagnosis and engine replacement.
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