Got the package Saturday. It is actually called "Mecedes Benz Lubrication Paste" and comes in a 1.1 lb container.

Applied it to the rails as well as the pieces of the panels that come in contact with them using q-tips. I was careful to not leave any cotton on the rails or panels.

Roof opens and closes without a sound from anything other than the motor now!

I will post pics tomorrow if not sooner.

Thanks again!

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1999 ML430
2003 Chevy Suburban Z71
1993 Honda Prelude V-Tech