I have a few aluminium Fords, Oldest is a 17 and has no signs of any body corrosion .. Its a plow/work truck with 15K miles on it V10 F450 Dump truck.. On its 4th set of manifolds, 2nd set of heads, 3rd set of rotors pads and callipers , 2nd set of trans lines, 2nd set od power steering lines...Im sure i forgot other stuff.. But the body is fine.