Pennzoil: Popular Science Apr 1986
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On the surface, the economics of this April 1986 promotion don't seem to work out: a first-class stamp that year cost $.22, meaning a single-slip redemption would yield negative two cents. But then there's the fine print stating a limit of 24 coupons: A customer who sent in all the slips from two cases of Pennzoil would pocket a cool $4.80. That's great, but has nothing on the $25 rebate being offered for anyone purchasing 5 quarts or more of Pennzoil Ultra oil today.