Why? If the post slips, then it's probably best not to grease. If it doesn't slip, then the grease can prevent bonding problems with Al frames and Al sleeves in other frames. Grease doesn't bother CF composites - if it did, parts like hub shells, shift levers, derailleurs, etc. would be a problem, and they are not. Never is a pretty absolute statement.ifcjti said:Never grease a CF seat post.