no real need to lube them at all, the delrin they are made from is self lubricating....if you splather (great word) it in oil or grease it will pick up dirt/drit and make a grinding paste in the breach and cause more wear than good if not cleaned religiously....we do put a dot of oil on them as they are assembled purely to stop the adbs drying and becoming brittle as the gun is sat in the case/flying round the world etc....
same goes for any ego bolt with the exception of the orings on the very early ones (early05 models) as they were there to seal against the breach....they were removed in later versions simply because your average player didnt want to have to lube them every time they play and when unlubed they created drag and slowed the gun down. the orings on the cure are smaller and not there to seal anything they are a cushion for the ball.
short answer....no. no need at all to lube them.