100%
STP High Mileage Oil Treatment 15oz
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
Pre-oil-change engine flush from STP, Chicago, Illinois. Dissolves sludge and varnish deposits before a fresh oil change. Add to old oil, idle for 5 minutes, then drain and refill. Made in USA since 1954.
Higher-scored alternatives
Products in automotive with stronger Made-in-USA evidence than STP High Mileage Oil Treatment 15oz.
More from STP
More American-Made Automotive
STP High Mileage Oil Treatment 15oz
78% American Score