95 540i 5HP30 Flush

[prosenfe]

Hi all,
I'm fighting with a dirty 5HP30. From what my mechanic says, doing a full flush could damage its sensitive electric valves. I'm thinking about disconnecting an oil cooler hose and putting it in a bucket. I'll start the car and pump new oil in through the fill hole in the bottom as the trans pushes the old fluid out the cooler hose. As long as I keep enough fluid in the pan (defined by BMW as fluid running out the fill hole) I should be okay. Right??? Any thoughts or suggestions are appreciated.

Thanks!
Paul

[Kalevera]

What do you mean by "dirty"?

A partial fluid change might be a good idea. I think flushing it, unless it's routinely been done, is a bad idea.

[632 Regal]

follow the ZF program rules dude, only replace the fluid that drains out with the proper fresh fluid when you change the filter every 30k miles. Thats about 3~4 quarts and only use an OEM filter to reduce problems with leaky 'O' rings on aftermarket brands.

[MBXB]

http://www.e38.org/zf-5hp30-service.html