2006 VW Passat squeal when not accelerating

My 2006 VW Passat squeals when I let off the accelerator after the car had been running for a few minutes. If I push the accelerator again it goes away. Started after last oil change, maybe coincidental.

Probably the AC or alternator belt. In that case, it is just an annoyance. You could snug it up a little to see if it goes away or maybe the belt is ready to be replaced.