Originally Posted by SurferRosa

Some threads require grease to the point you may have an extremely difficult time with disassembly later. These include spoke nipples and the pedal axles. I'd also include here friction fit interfaces like aluminum seatposts inside steel seat tubes and quill stems inside steerers.

There are a few bolts I do not grease as long as the threads are rust free. These include cable anchors, saddle tension bolts, down tube friction shifter bolts and rim brake shoes/pads.