Since we are in this topic for E9x ATF, I like to share the following, published by ZF Transmission.
Maintenance recommendations ZF automatic transmissions
For the first time the 3 series will see a six speed Automatic Transmission (GA6HP19Z)
with STEPTRONIC.
ZF 5 and 6-speed as well as the ZF 4HP20 automatic transmissions are filled maintenance-free with specially developed partially synthetic ATF oils. Maintenance-free fills are intended for normal operating conditions. Especially driving at very high operating temperatures can result in accelerated aging or increased wear of ATF oils. In the event of operating conditions, such as:
- highway driving in top speed range,
- offensive, sporty driving style,
- frequent trailer operation,
.. being above average, oil purification (oil change) on automatic transmissions is recommended between 80,000 km and 120,000 km, or 8 years, depending on the load.
In each case, only released ATF oil may be used for oil changes. And oil changes must be performed in accordance with the relevant specifications.
Emergency Release
In case of an emergency (e.g. failure of the power supply system), the selector lever can
be released by operating the emergency release. The emergency release is accessible
by removing the selector lever cover. The selector lever is released by pressing on the
pawl.
Stationary Disconnection
The gearbox features a stationary disconnection (uncoupling) function for the torque converter.
The torque converter is disconnected from the drivetrain instead of running the
engine against the torque converter when the vehicle is stationary. By disconnecting the
torque converter with the vehicle stationary, the engine is subject to minimum load and
fuel consumption is reduced.
Disconnection (uncoupling) of the torque converter is achieved as a function of the
following signals:
• Brake operated
• Selector lever position D
• Gear oil temperature > 20°C and < 120°C
• No trailer signal applied
Now ain't the above a lot more easier to "swallow" than people keep telling u it's "LIFETIME" !! :wink:
Cheers!