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      08-13-2023, 06:26 PM   #22
turbobeagle
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Drives: 2020 540i M Sport
Join Date: Oct 2020
Location: SF Bay Area

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So I applied the easier version of this fix from top side with pipe insulation as suggested earlier. It worked great!

But the noise has now returned a month later. I checked the fix, and it turns out the pipe insulation had gotten compressed and was no longer applying much pressure on the reservoir. I replaced with some fresh pipe insulation and all is well again.

Any recommendations for an alternate material?

I don’t necessarily need a perfect fix, but maybe something that could last longer than a month. I don’t mind having to do this a couple times a year, but monthly would be annoying.
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