It it's natural nut, then yes. It will have additional oils in it.

As long as you don't use a lubricant that contains nut oils.

Yes the only major oils I know that are in there are Cocoa nut oils because the are rich with healthy proteins.

Nut oils like peanut oil. Safflower oil, corn oil, soybean oil, sunflower oil, and sesame oils are all good sources of polyunsaturated fats. Of course, olive oil is. Fish oils are also a good source.

The oils in the peanut will be displaced by the water and the nut will get very soggy. If it is in the shell, the shell will get soft and it will take longer for the nut to go soggy.