found: A Pennzoil day. [MP] 1975.
found: Petzinger, T. Oil & honor, 1987:CIP t.p. (Pennzoil)
found: Moody's indust. man., 1994(Pennzoil Company, Houston, TX)
found: Pennzoil-Quaker State Company. Annual report, 1998:p. 6 (Pennzoil-Quaker State Company was formed Dec. 30, 1998 when Pennzoil Company restructured by spinning off its marketing, manufacturing and fast lube businesses, which then merged with all of Quaker State Corporation)
notfound: Annual report, 1963: p. 1 (our company also changed its name from South Penn Oil Company to Pennzoil Company)
