100%
STP Additive Kit Fuel Injector Complete Fuel Treatment
by STP— Made in Multiple US facilities
Verified American Made
American Score
78% — Brand-verified
Why not 100%? Limited public documentation of specific factory location
Manufactured in Multiple US facilities
Manufacturing in USA since 1954Verified through 2 independent sources
- Brand website
- Product listing
Evidence Breakdown
Factory: Unspecified
Website claim: Yes
History: 20+ years
Overseas lines: None known
Complete fuel system treatment kit with fuel injector cleaner and carburetor cleaner. Made in USA. Cleans entire fuel system to restore power and improve fuel economy. Easy pour bottle design.
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STP Additive Kit Fuel Injector Complete Fuel Treatment
78% American Score