Financial Gurus: Changing one's tax status for overtime pay

Factual Questions
1

I work in a hospital and get a lot of OT. Unfortunately it gets eaten up in taxes. One of my colleagues recommends I change my tax status from claiming one exemption to claiming as many as 9, and then changing it back when the work week normalizes. I say that in the end, it makes no difference. I claim one and file short form. What say you all?

Thanks

Q

2

It makes no difference in the sense that in April, the amount you paid over the past year would be the same.

3

that is, the amount you paid over the past year plus the check you sent them in april (or minus the check they sent you) would be the same.