Is STP Made in USA?
Last verified: March 2026 · Based on 6 verified products and public manufacturing evidence
Yes — Made in USA
STP manufactures its products in the United States — specifically in Multiple US facilities. Our verification team confirmed this through public manufacturing claims, factory records, and product listings.
Verification Confidence
Average confidence score across 6 verified products — scores ≥70% are shown on this site.
Manufacturing Details
- Made in
- Multiple US facilities
- Headquarters
- Chicago, IL
- Location detail
- USA manufacturing confirmed
- History
- Long-established (50+ years)
- Founded
- 1954
Verification Evidence
STP (Scientifically Treated Petroleum) has formulated automotive fuel and oil additives in Chicago, Illinois since 1954. Oil treatments, fuel injector cleaners, and gas treatments manufactured at US facilities. Made in USA claim on all product lines. One of the most recognized names in American automotive care.
About STP
STP has formulated automotive fuel and oil additives in Chicago, Illinois since 1954, becoming one of the most recognized names in American automotive maintenance chemistry with a presence in virtually every auto parts store in the country.
Heritage & History
STP — Scientifically Treated Petroleum — was founded in Chicago, Illinois in 1954, developing the oil treatment formula that Andy Granatelli would make famous through his association with Indianapolis 500 racing. The racing connection gave STP a credibility in American automotive culture that translated into commercial success far beyond the racing market. By the 1960s, STP Oil Treatment was a ubiquitous presence in American service stations and filling the trunk of the typical American car owner.
The Chicago formulation heritage continues today through a product line that covers oil treatments, fuel injector cleaners, gas treatments, and diesel fuel additives. STP's longevity in the automotive additive category reflects the continued demand for products that address the real-world challenges of maintaining older American vehicles — fuel system deposits, engine sludge, and the combustion inefficiency that accumulates in engines that don't receive regular professional service.
Formulated in the USA
STP formulates its automotive additives at US manufacturing facilities, with the Chicago headquarters overseeing product development and quality standards. The oil treatment formula uses viscosity improvers and anti-wear additives that reduce metal-to-metal contact at startup — the operating condition where engine wear is most concentrated because the oil film has drained away from bearing surfaces.
The fuel injector cleaner products use detergent chemistries that dissolve the varnish and carbon deposits that accumulate on injector tips and intake valves over time. The effectiveness of these products is measurable by before-and-after fuel economy and power tests — the kind of practical validation that has sustained STP's reputation across generations of American car owners.
American-Made STP Products
USA Verified
USA Verified
Frequently Asked Questions
Is STP made in the USA?
Yes. STP is made in the United States, manufactured in Multiple US facilities. STP (Scientifically Treated Petroleum) has formulated automotive fuel and oil additives in Chicago, Illinois since 1954. Oil treatments, fuel injector cleaners, and gas treatments manufactured at US facilities. Made in USA claim on all product lines. One of the most recognized names in American automotive care.
Where is STP manufactured?
STP manufactures its products in Multiple US facilities. The company is headquartered in Chicago, IL.
Which STP products are made in the USA?
We carry 6 verified American-made STP products across Automotive. Every listing is linked directly to Amazon with verified manufacturing evidence.