Anywhere, accept for your face. Unless it says specifically that you CAN swallow it. I just wouldn't recommend getting it in your eye.
maybe
Lots of lube, I guess
if you did not have lube you would a over heat and b lock up ever you dont put lube into it keeps the friction to a controllable level and to dissipate heat
Lots of lube, I guess
No lube required. If it is loose or noisy it's time for replacement.
Synthetic lube
1500 cc/ml
Use caliper lube
Yes, it's a good idea to smear a little assembly lube on the bearings when you put them in.
Vaseline can be purchased from any pharmacy, is petroleum-based, and can easily be used as a lube.
No, do not put any lube in the barrel, but on the threads.
because you forgot to put lube on it