Quote:
Originally Posted by ihbase
Did you solve this issue? My guess would have been incorrect fluid level.
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I would buy that it was incorrect level if I hadn't drained and filled it 3 times now all with the same results.
Either way I have an update: I dropped the pan again last night to find that the o-ring at the top of the suction filter (
https://www.fcpeuro.com/products/bmw...ag-28107850148) rolled out of its groove upon installation. Easily avoidable mistake as you can see all the way around the seal if you crawl around a bit. Luckily the bore it sits in has a hefty chamfer, so the seal was still in fine condition.
I also had actually been trying the URO cast aluminum pan:
https://www.fcpeuro.com/products/bmw...ts-28108070791
It was weeping fluid at the back so I returned it and got a Getrag pan to replace it. I would advise against the cast pan, it had a lot of flash and sharp edges left over from manufacturing, and the seal is a different design that did not seem to want to seal. I also think the metallic pan may have amplified the noise, some searches led me to other threads linking metal pans and weird DCT noises.
After reinstalling and refilling with the OEM pan, the sound was still there but was much quieter while laying under the running car.
With the undertray installed and the car on the ground I could barely hear it, making me question whether I just didn't notice it before my initial service, and the combo of the slipped o-ring and aluminum pan amplified it.
Either way, at this point I have checked and rechecked everything I could so I'm going to try to move on with my life and will keep and ear out for any change.
