I think all good quality oils will do the job fine. The main thing is to remember that nothing will be worth a damn in 20 yrs or maybe even much less. Besides, it'll be full of powder residue and dirt if you've done your part. Probably a good idea to pull 'em down to their guts, clean and lube, every 10,000 rounds or 10 yrs, whichever comes first.

"Turbine oil"...I don't think I've seen that on my hardware store's shelf. I'll make a point to look.