I fired mine up this week after several months and had the exact same noise. I let it idle for a bit and it got quieter but didn’t completely go away. Once I went for a spin around the block it was pretty much gone. That was on Thursday. I fired her up again today and there was no noticeable noise 
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor  )
1988 E30 Coupe - Royalblau Metallic
2003 S4 Avant - Light Silver Mettalic
2016 S5 Coupe Black Edition - Ibis White
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