100%
STP Ultra 5 In 1 Fuel System Cleaner and Stabilizer
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
Fuel injector cleaner from STP, Chicago, IL. One bottle treats up to 15 gallons, cleans fuel injectors and intake valves. Restores lost power and improves fuel economy. Made in USA. Trusted since 1954.
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STP Ultra 5 In 1 Fuel System Cleaner and Stabilizer
78% American Score