STP Octane Booster Fuel Additive for Gasoline Engines, 5.25 fl oz
STP Octane Booster Fuel Additive for Gasoline Engines, 5.25 fl oz
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STP Octane Booster Fuel Additive for Gasoline Engines, 5.25 fl oz

4.6 stars out of 243 reviews
(4.6)|
243 ratings
STP Octane Booster Fuel Additive for Gasoline Engines, 5.25 fl ozSTP Octane Booster Additive 5 25 Fluid Ounces24 pack STP Octane Booster Additive 5 25 Fluid Ounces6 pack STP Octane Booster Additive 5 25 Fluid Ounces2 pack STP Octane Booster Additive 5 25 Fluid Ounces12 pack STP Octane Booster Additive 5 25 Fluid Ounces
Size:5.25 fl oz
selected, 5.25 fl oz, $4.48
85.3 ¢/fl oz
Pack Size:Single

Key item features

  • Octane Boost: This 5.25 fl oz fuel additive is formulated to boost octane levels and restore engine performance in gasoline engines.
  • System Cleaner: The product actively cleans the fuel intake system, which helps to prevent the accumulation of deposits and improve fuel efficiency.
  • Power Restoration: It aids in restoring lost power and acceleration, contributing to a smoother and more responsive driving experience.
  • Knock Reduction: The additive effectively reduces engine knocking and pinging, which can be detrimental to engine health and performance.
  • Fuel Compatibility: Containing MMT + Synthetic Technology, this additive is compatible with any gas engine, including modern cap-less gas systems.
  • Usage Simplicity: For optimal results, simply add one bottle to the fuel tank before or after fueling during regular fill-ups.
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Current price is $4.4885.3 ¢/fl oz
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Subscribe, Your usuals, on your schedule, Save time and stay stocked!, $4.48
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Customer ratings & reviews

4.6 out of 5 stars
stars243 ratings155 reviews
How item rating is calculated
  1. 5 stars77% (186)
  2. 4 stars16% (39)
  3. 3 stars4% (9)
  4. 2 stars2% (4)
  5. 1 star2% (5)

Reviews summary

Pros
  • : Offers great value at this cost.
  • : Has a positive impact on vehicle performance.
  • : Increases fuel efficiency per tank of gas.
  • : Provides a significant boost in acceleration and responsiveness.
  • : Provides improvement depending on conditions.
Neutral
  • : Can reduce engine ping with lower octane fuels, but may not eliminate it in all cases.
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Showing 1-3 of 155 reviews

Jan 19, 2026
Oscar
Item details
Size: 5.25 fl oz
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

This stuff is serious, it gives your engine a boost, kinda like turbo boost and engine feels smoother when idle

Helpful?3ON7LBZOGP5416817401
Sep 16, 2025
Larry
Item details
Size: 5.25 fl oz
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

I have. A large v 8 that requires a higher octane,,, i have found it to be much cheaper to add this octane booster and use the 87 octane at the pump... i can't tell the difference between this or the 93.

Helpful?3ON7LBZOGP5416817401
Sep 2, 2023
DTMaintSpecTeezLlc
Top Reviewer
Item details
Size: 5.25 fl oz
5 out of 5 stars review

Verified Purchase

Let's do Mach1 !!!!

I use 93 Octane in my 93' F-150 8cyl 5.0 and a bottle of STP octane buster and the results are worth the extra money. Gets much better gas mileage. Starts and runs better all around. the extra power you get on the interstate or highways whether it just be passing or pulling the trailer exceptionally the better. I've been doing that for a couple years now and I've had no issues whatsoever and I've had no problems. if you do want an extra performance sandwich recommend this STP octane buster. it is price decently compared to everything else.

Incentivized Review
Helpful?3ON7LBZOGP5416817401