Quaker State is one of the oldest American motor oil brands, founded in 1931 in Oil City, Pennsylvania. The brand is now a subsidiary of Shell's SOPUS Products (Pennzoil-Quaker State Company) alongside Pennzoil, and its oils are formulated and distributed from Houston, Texas. Quaker State's flagship product line is its Full Synthetic series, which spans multiple viscosity grades certified to current API SP and ILSAC GF-6A specifications.
The brand occupies the mid-tier of the synthetic motor oil market — priced below Mobil 1 and Castrol EDGE but meeting the same API/ILSAC certification tier as those premium brands. Quaker State's primary differentiator is its 10-year or 300,000-mile lubrication warranty (enrollment required at quakerstate.com/warranty), which applies when exclusively using Quaker State products.
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