Originally Posted by shane45
Grease/oil can cause CF to deteriorate.
I think this is voodoo in a lot of cases, but I wouldn't automatically rule it out. The question of whether grease will penetrate the coating and expand the fibers (which will cause your bike to immediately burst into flames and send you off a 320984102 foot cliff), as well as the question of 'roughing up' the finish depends not on the carbon so much as the finish applied over it, which varies from maker to maker. This finish is usually plenty smooth enough to slide into the seat tube no problem...if not, hone it out...aluminum is cool with that. Grease often causes the surface to be too slippery unless the seatpost clamp is tightened past recommended torque, that's the most obvious reason for not greasing.