Servicing: What is involved in a service by a manufacturer/Air gun repair agent? and how often should it be done?

Maintenance: I have been told to wipe Silicone oil over the metal and wood parts of my guns to keep them free moving and free from corrosion and rust. I was also told in one RFD to not bother doing anything to my pistols. is this correct?

BUT this is printed in my BSA ultra instructions.... (see middle paragraph)

http://i221.photobucket.com/albums/d...217_163422.jpg