Here's a minor annoyance with my W212... a whistling windscreen. Get up to speed, say 60mph and above and there's a randomly fluctuating whistling noise. Sounds like a little bird chirping. It is one of those sounds that one you hear it you can't stop hearing it. At first I guessed/hoped it was the gun-sight on the bonnet so after some double-badging advice and the removal of said 'sight I was hopeful it would go away. Sadly not. I am pretty sure it is coming from the top of the windscreen, somewhere to the driver's side of the rain/headlight etc sensor. So... anybody else had similar? Is it worth me getting some silicone sealant and trying to get some in by prying up the windscreen rubber? Or just get the screen professionally refitted? Interesting that I note in the service history a mechanic was asked to look at a 'whistling noise' and ticked the 'No fault found' box.