Blog 2: Let’s Talk ZF Servicing
Servicing the ZF8 transmission in BMWs is an essential part of vehicle maintenance to ensure smooth shifting, prevent premature wear, and prolong the life of the transmission. The ZF8, or ZF 8-speed automatic transmission, is commonly found in many BMW models and is known for its smooth shifting and performance. Here’s a general overview of what you should know when it comes to servicing this transmission:
Transmission Fluid Maintenance
Fluid Change Interval: Unlike older automatic transmissions, the ZF8 transmission is a "sealed for life" unit according to BMW. However, many experts recommend changing the fluid every 60,000 to 80,000 miles, especially if the car is used for high-performance driving or in demanding conditions.
Why Change the Fluid? Over time, transmission fluid can degrade and lose its effectiveness. Regular fluid changes help maintain the transmission’s performance and prevent overheating, which can lead to costly repairs.
Type of Fluid: It’s crucial to use the correct transmission fluid specified by ZF for the 8-speed transmission. Using the wrong fluid could damage the system or lead to poor shifting performance. We always recommend genuine ZF fluid and parts.
Transmission Filter and Pan
The ZF8 transmission has a filter that should ideally be replaced during fluid changes to ensure that contaminants don't cause premature wear. It's not always necessary to replace the pan, but it’s a good idea to inspect it for debris, cracks, or leaks.
Fluid Level Check
Checking the fluid level can be tricky as the ZF8 does not have a dipstick like older models. Instead, fluid levels are checked via a fill plug under the car. This is typically done while the transmission is at operating temperature.
If the fluid level is low, it can lead to erratic shifting or even transmission damage. Low fluid levels should be corrected immediately.
Software Updates
BMW uses adaptive transmission software that adjusts shift patterns based on driving style. Occasionally, software updates may be needed to improve shifting quality or address transmission-related issues. These updates are typically carried out at your local BMW dealership.
Signs That the Transmission Needs Servicing
Delayed or Harsh Shifting: If you notice that the car is hesitating or shifting roughly between gears, this could indicate that the transmission fluid is low or contaminated, or there’s a deeper issue.
Slipping Gears: If the transmission starts slipping, it’s a sign that internal components are worn and need attention.
Fluid Leaks: Any transmission fluid leaks under the car need to be addressed immediately. These could be due to damaged seals or gaskets.
Cost of Servicing
Servicing a ZF8 transmission can vary in cost, but you can expect fluid changes and filter replacement to start from £400, depending on the shop and whether the car is still under warranty. A full transmission rebuild, however, can be significantly more expensive if there are deeper issues.
DIY vs. Professional Servicing
While it is possible to change the transmission fluid yourself with the right tools, it’s generally recommended to have the ZF8 transmission serviced by professionals who have the experience and tools necessary to perform the job correctly.
Additionally, a BMW dealership or a certified repair shop will often have access to the latest software updates and diagnostic tools, which can be essential in keeping your ZF8 transmission running smoothly.
Conclusion
Maintaining the ZF8 transmission in your BMW is crucial for the longevity of your vehicle and the performance of the transmission. While BMWs typically don’t require frequent transmission fluid changes, regular service checks and prompt attention to issues can help prevent more significant problems. If you're unsure about the state of your transmission, it’s always a good idea to have a certified technician check it out. If you want to purchase a kit for DIY install or get booked us for profesional servicing we can be contacted here
