If it works on guns it should work on knives. Pretty much any good light oil like rem oil, militec etc. will do the job. There are also some products made specifically for knives, tuff cloth, and tuff glide etc.
I don't know exactly what coating is on the beckers, probably a powder or epoxy coating of some sort. It should protect the blades very well except for the cutting edge (they are carbon steel right, not stainless?) It will wear away over time, and then wiping them down will become more important.
There are actually hundreds of threads on different coatings and lubricants in the general forum, if you want to do a search. I beleive there is also a camillus forum if you go to the top of the page and click on makers/mfgs , where you could get info more specific to the becker knives.
Welcome to the forums.