I'm a great 'forum reader' regardless of which car I've got, so I've always got my nose in the Z4 Forum, & it's paid dividends.
Everyone said the DISA valve will go 'belly up' at some point, so even though 'my car' was fine, I bought an I6 upgrade a few weeks ago waiting 'for the right moment' to refurb the DISA. "It doesn't need doing" I kept telling myself, there's no rattle, no loss of power, no difference.......until today........thought I heard a rattle from the valve area so took off the DISA valve, you can see the crud hanging around the flap base! It was lose & quite a lot of play up & down as well as sideways! Strange thing is, I could turn the flap but the vacuum rod stayed still, nothing appeared broken it just didn't seem to work. Cleaned everything up & I must say, the upgrade kit is well worth the money, nicely made, easy to do & the end result is a nice tight paddle! Checked it all over & seems to work nicely now. I would say it's the original which at 106k I have no complaints.
Morale of this waffle is.........even if you think 'yours' is fine, just take half an hour & check it out, it's easy to take off, less than 10 minutes even to a diy spanner head like me!..........you maybe surprised. There are lots of youtube guides if you look.
Last sentence.....thanks to everyone on here, great forum & so much info around.
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my god such a cheap part could cause so much damage!