frame rust - so far so good. i got the truck in august of 2005 and have had it oil sprayed by my mechanic every year before each winter.
touch wood, the frame's still looking good.
have had my 2003 matrix oiled since purchased as well and again, everything looks solid.... so far.
he does such a good job of oiling that the vehicles are still dripping oil in the fall when they're getting re-done.