Agree with ard and others. DO NOT FLUSH ANY TRANSMISSION. EVER.

If I were you, I'd drain the pan, remove the pan/filter, replace the seals and sleeve, install a new pan/filter, top off with new BMW OE or real ZF fluid. I said before, you got good miles out of that transmission and you're on the tail end. When it goes, you'll never know if it's because of the fluid/filter change OR if you did nothing.

Now that I've established some level of service with my transmission, I've decided to replace the pan/filter every other "1/2" fluid change which will occur every 50k miles. My transmission is young but coming up on 200k miles with no issues at all during my ownership. I hope this continues.

I'd run some Liqui-Moly fuel cleaner through a couple of tanks. They offer a few different types: Valve Clean, Fuel System Cleaner, Speed Tec Gasoline, Gasoline Engine System Cleaner, Injection Cleaner, which are good. Lately, I've been using Archoil products in my X5d and diesel truck and am pretty happy. Read that as nothing has blown up. Yet. Chevron Techron is a great product, also. Maybe you live in a region where Chevron w/Techron or Texaco w/Clean System3 is available at the pump. Run a few tanks with whatever you choose and then change the engine oil and filter.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim