My MPE only rattled on start up if the valve was open. I got in the habit of turning on the car in comfort mode and closed valve, leaving the neighborhood then opening everything up.
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2016 f87 ///M2 || Long Beach Blue || DCT || (Current)
2014 f22 M235i || Alpine White || Manual ||
2000 e46 323Ci || Light Metallic Gelb || Manual || (Current)
1991 e30 318is || Alpine White || Manual ||
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