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 241 reviews
(4.6)|
241 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
Price when purchased online
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Subscribe, Your usuals, on your schedule, Save time and stay stocked!, $4.48
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One-time purchase $4.48

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STP Octane Booster Fuel Additive for Gasoline Engines, 5.25 fl oz $4.48 85.3 ¢/fl oz

STP Octane Booster Fuel Additive for Gasoline Engines, 5.25 fl oz
current price $4.48
85.3 ¢/fl oz

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

4.6 out of 5 Stars. 241 reviews

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Customer ratings & reviews

4.6 out of 5 stars
stars241 ratings154 reviews
How item rating is calculated
  1. 5 stars76% (184)
  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 154 reviews

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
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
Nov 21, 2025
Kurt
Item details
Size: 5.25 fl oz
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

One use at fill up keeps the auto mechanic looking for work elsewhere.

Helpful?3ON7LBZOGP5416817401