The Pennzoil-Quaker State brands are sold under SOPUS Products with the address of Shell's office in Houston, Texas.

Quaker State's origins may be traced to the founding of Oil City in Pennsylvania, in the 19th century.

[1] By 1915, Quaker State advertised in The Saturday Evening Post becoming a known brand in the U.S. "The Franklin requirements were severe.

It concluded: "Quaker State is certified and guaranteed to be the highest known quality oil suitable for every engine purpose.

Quaker State opened a new refinery in Newell, West Virginia, that allowed the company to reach sales of $300 million in 1975.

During the following years, Quaker State acquired the Valley Camp Coal Co (1976) and new headquarters on Elm Street in Oil City, also buying car parts suppliers, Corn Brothers of Smyrna, Georgia; National Oil Company of Newark, New Jersey; and Texstar Automotive Corporation, based in St. Louis, Missouri.

[1] In 1989, the company reorganized itself into five divisions, including the refining corporation, car maintenance, insurance, trucks, and energy.

In 1994, Quaker State sold its insurance business and purchased Speciality Oil Corp. for $90 million.

In 1995, the company announced that it would move to Dallas and sell its natural gas business to focus on lubricants.

[11] Quaker State was also official lubricants partner of Italo-American Ferrari-works team Risi Competizione in 2004 until 2008.