Should I oil my seat post? In a previous question I asked how to remove rust from my seat tube/post. In the comments of one answer somebody said I should be oiling my seat post to prevent it from rusting into my seat tube, but I'm concerned this will cause the tube to slip when jarred.

Should I be applying a thin coat of oil to my seat post to prevent rust from forming between it an the seat tube? What sort of oil, if any, should I be using?
Greasing your seatpost will prevent problems like this:  "Removing Seat Post rusted into downtube".

Don't use chain oil, grease is what you want.  As whatsisname pointed out, all fasteners on your bike should be lightly greased.  This is what keeps them from corroding and seizing over time, becoming a real pain to remove.

If you have trouble with a slipping seatpost (like me), carbon grease is what you need.  Contains enough grit to keep from sliding, while still offering protection.