Apparently it makes a difference whether you mail in the form from Pennzoil's website or get the Wal-Mart gift cards using the rebate forms attached to the 5-qt jugs. If you do the gift cards you can get two per household. If your wally world doesn't have the rebates on the jugs, then at least you can get one rebate with the Pennzoil form.
thread on Slickdeals.net

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'85 4Runner (mostly stock) <img src="/forums/images/graemlins/kewl.gif" alt="" /> | '94 Miata <img src="/forums/images/graemlins/smile.gif" alt="" /> | '98 Saturn SC2 <img src="/forums/images/graemlins/rolleyes.gif" alt="" /> | '12 Ford Fusion (wife's company car)