I used d-bol tis spring that I got in 99 or 2000, can't quite remember. Had better results with it this time then last. Had it in an air tight container in a cool dark space though.
i believe it's prob not bad, but not as effective as it would have been before the EXP date...I've read that for every year it degrades X%, but I'm not sure on the #'s or the validity, I'd say go for it!!