Quote:
Originally Posted by montr
I have not done a transmission oil change on the 8 speed ZF but I have done it on my E90 6 speed ZF. The oil level MUST be flush with the side plug while engine running and car is level.
To do this, my car was jack up and secure, a ramp for the front wheels and 2 jack stands in the back. I used a funnel and attached a long clear hose. I was able to fill the transmission from the top of engine bay while engine running. When the level was right, car still running, I went under the car, disconnected the filling hose and installed the plug.
If the engine is off, oil level will appears to be too high.
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I have read this about some transmissions as you mentioned. Also, some DIY videos specified this for the ZF8HP. After seeing the fluid level being the same, I started to think about this.
However, I have not found this specifically stated in some of the more official sources, including the FCP Euro guide. If it would be a profound requirement, I would imagine they would state this.