I use antiseize compound on all the rubbing surfaces (where the pad metal backing rubs along the caliper). Don't put too much on to avoid any getting on the working surface of the pad. I don't think it is a good idea to use ordinary grease as it will flow when the brakes heat up. There are other products (hi temp brake paste) that work like the antiseize compound.
I use the OEM brand of pad (I believe one of them is Pagid) which seem to be quieter although rather dusty.
1982 300D Turbo