Before this thread on sealants (one of the "sealants" in the suggested list, is a lubricant for the case thru-bolt o-rings) gets going on a hard tangent, some folks may be interested as to what's the background on this Dow 55 vs. Krytox debate
http://forums.pelicanparts.com/911-engine-rebuilding-forum/452985-your-opinion-wanted-green-bolt-through-viton-o-rings-rtv.html
And since we're rehashing stuff again, i'd like to rehash a point I made before. Krytox is a line of lubricants. When touting what's best to use, one should name the specific lubricant. In this case I believe it's GPL-207 (general purpose lubricant) that's being touted.