The 'CSL' in Restore is small, soft particles of Copper, Silver, and Lead. It is supposed to 'bake' to the cylinder walls during engine operation and seal the rings better. I have read a fair few accounts that in very badly worn out old engines, it DOES make them run better, and reduce oil consumption.
If your engine is very, very worn out, it MIGHT help you get some more life out of it. If your engine runs fairly well, it will most likely do nothing.