hello, have recently a R-350 L. since I am a changer from an E-270 cdi I enjoy of course the quiet in the vehicle. but: from the area of the doors come with light floor waves in city traffic always so light, fine squeaky noises. as soon as you drive the windows down only a few cm, the noise is completely gone. therefore I type on the sealing rubbers or window guides. have you made similar experiences and found a solution? maybe Talkum on the seal apply?! thank you for pointing out, because without this little pain-ache the sled is really fantastic in things comfort! 🙂 greetings hawaii