Nylon glides like that are said to be "self-lubricating". They really shouldn't need much. However, if you do want to slick them up, **don't use oil**. That'll collect dust and lint and make a big mess, which can end up on your carpet and clothing.

**Use a dry lubricant**, like wax or Teflon. You want something that dries non-sticky and sheds dirt rather than accumulating it.