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When considering a BMW Z4, you’re choosing more than just a car; you’re opting for a blend of luxury and performance.
With the Z4, there are a number of things to look for to find the right model for your needs.
In this blog, we will cover all the different things you should look out for when looking to buy a BMW Z4.
Z4 Model Specifications and Options
The BMW Z4 offers a variety of engine choices to match different performance needs. Options include the 2.0-litre N46 four-cylinder engine and more powerful six-cylinder versions such as the 3.0-litre M54 and N52.
For increased performance, consider the sportier M models, which improve both handling and power.
Models updated after 2006 also bring new technology and a facelift, raising the overall driving experience.
It’s important to know the differences between engines; for example, the M54 is known for its reliability, while the N52 may require more frequent checks of its electrical components and oil levels.
Additionally, high-spec Coupé models, though rarer, have increased in market value, making them a potentially good investment.
Check the Maintenance History
When reviewing the maintenance history of a BMW Z4, focus on service records that show routine checks and repairs, particularly for engines such as the M54 and N52, which are known for certain problems.
It’s vital to check for regular oil changes—look for them every 16,000 km as suggested. This regular maintenance ensures that the engine has been looked after and prolongs its life.
- Regular Oil Changes: Look for clean, amber-coloured oil at the correct levels, which helps maintain engine efficiency.
- Documented Repairs: Ensure there’s a detailed log of repairs, such as the replacement of a faulty DISA valve or an electric pump, demonstrating proactive maintenance.
- Soft Top Care: Check that the convertible roof is well-kept, free from water damage and operates smoothly.
A high mileage isn’t necessarily a problem if the car has been consistently well maintained.
Notable Z4 Issues to Look For
Roof Mechanism Failure (Convertible models)
The electric roof on the Z4 can sometimes fail due to water damage to the motor. This is often caused by blocked drainage channels, leading to water ingress into the motor compartment.
Steering Issues
Some Z4 owners report problems with the electric power steering, particularly stiffness or “sticky” steering, especially noticeable at higher speeds or during warm weather. This can be due to faulty steering column components.
Engine Oil Leaks
Oil leaks from the valve cover gasket or oil filter housing gasket are common, especially as the car ages. If not addressed, this can lead to oil loss and engine damage over time.
Cooling System Problems
Like many BMWs, the Z4 is prone to issues with the cooling system, particularly the water pump and thermostat. Plastic components in the cooling system can become brittle over time and may crack or fail, leading to overheating.
Suspension Wear
The Z4’s suspension, especially the rear suspension components like the control arms and bushings, can wear out prematurely. This can lead to uneven tire wear, poor handling, or clunking noises from the rear.
Electrical Issues
Some owners report issues with electrical systems, including the central locking, windows, and dashboard warning lights. This can be caused by aging wiring or faulty sensors.
HPFP (High-Pressure Fuel Pump) Failure
In models equipped with the turbocharged engine (particularly the N54 engine in earlier versions), the high-pressure fuel pump is known to fail, causing stalling or rough idling.
Vanos (Variable Valve Timing) Issues
The Z4 is also known for having problems with the Vanos system, especially in the earlier models. Symptoms include rough idling, power loss, and poor fuel economy.
ABS and DSC (Dynamic Stability Control) Failures
Some Z4 owners have reported issues with the ABS pump or DSC module, leading to the ABS warning light coming on and reduced braking performance.
Battery Drain
Due to electrical issues or parasitic drain, the battery in the Z4 can sometimes deplete faster than expected, leading to difficulties starting the car.
Conclusion
If you are considering buying a Z4, we can perform a pre-purchase car inspection for you to give you insight into it’s true condition.
Speak to us today by calling 09 441 3635 or emailing service@dodsonmotorsport.com to book your inspection in.