Should I grease press fit attachments?
if you are using a high-end aluminum-shell BB, then get the "press-fit" specific Loctite and use that.  this stuff is made for press-fit applications and holds well without any creeks.  I put it in for my Cervelo R5 and a ceramic-speed BB and it is perfect over 3 years later. If you are using those cheap, plastic cups, then grease and go.