STP 3-Pack Gasoline Engine & Fuel Additives - Fuel System Cleaner, Gas Treatment, & Octane Booster for Better Engine Performance
STP 3-Pack Gasoline Engine & Fuel Additives - Fuel System Cleaner, Gas Treatment, & Octane Booster for Better Engine Performance
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STP 3-Pack Gasoline Engine & Fuel Additives - Fuel System Cleaner, Gas Treatment, & Octane Booster for Better Engine Performance

4.6 stars out of 299 reviews
(4.6)|
299 ratings

Key item features

  • Complete Kit: Includes one 5.25 fl oz STP Gas Treatment, one 12 fl oz STP Ultra 5-in-1 Fuel System Cleaner, and one 5.25 fl oz STP Octane Booster.
  • Gas Treatment: Regular use improves gasoline quality, maintains fuel efficiency, and prevents harmful carbon, gum, and varnish deposit buildup.
  • Fuel System: Use every 4,000 miles to deep clean the entire fuel system, remove deposits, reduce friction, and fight corrosion with a proprietary PEA blend.
  • Octane Booster: Reduces the need for high-octane fuel, boosts octane levels, cleans the fuel intake system, and helps restore lost performance.
  • Engine Performance: Each additive is designed to prevent specific issues, improve acceleration, and reduce knocking and pinging for smoother engine operation.
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Current price is $16.97
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Customer ratings & reviews

4.6 out of 5 stars
stars299 ratings283 reviews
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Reviews summary

Pros
  • : Designed for effortless access.
  • : Designed for smooth pouring.
  • : Enhances engine power and smoothness.
  • : Lasts for several weeks and withstands accidental drops.
  • : Has little to no noticeable smell.
  • : Allows for spill-free addition to tank.
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Showing 1-3 of 283 reviews

Jan 1, 2026
Michael
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Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

great stuff

my car runs like a sewing machine since added it

Helpful?1QF88XHZFPHR13561774039
Feb 5, 2026
mike
Top Reviewer
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Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

great gas addidtive

seems to help overall performance. easy to use too.

Helpful?1QF88XHZFPHR13561774039
Dec 19, 2025
BOBBY
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Reasonable price n quick shipping

Helpful?1QF88XHZFPHR13561774039