Hmmm..... that's for the ideas. I have this spray on lubricant that I use with my boat called Sail-Kote. They don't say what it's made from (or if it does, I don't remember and I don't have the can with me) but they pitch it as a dry lubricant without silicon or oil based products. Do you think I could spray that behind my dash and I guess along the outside of the lower windshield?

It's definitely not a whistling noise, it only appears and changes with undulations in the road. It's the most horrible sound ever.

__________________
1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside