☰
Product Image
AMSOIL DOMINATOR® Octane Boost
Product code : COBBE-EA
Roll over image to zoom in
AMSOIL DOMINATOR® Octane Boost
Product code : COBBE-EA
Current price:
$18.29
Retail Price (CAD)
355 ml Bottle is temporarily out of stock. Try another available size from the menu above.
You are already subscribed to this product. As soon as the product appears in stock, we will notify you by email.
Added to Your Shopping Cart
-
- Increases octane up to 4 numbers for improved performance
- Maximizes power
- Reduces engine knock
- Improves ignition & responsiveness
- Helps fuel burn more cleanly
- Removes carbon deposits
-
We offer easy returns for customers. If your product is unused and unopened, you may return it within 30 days for a full refund of the purchase price. View full AMSOIL Return Policy.
-
We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.
About this item
-
For off-road and racing use only. Increases octane up to four numbers. Helps reduce engine knock for maximum power, responsiveness and performance.
See the product data sheet for full details.
INCREASES OCTANE UP TO 4 NUMBERS
- Significantly increases engine response and power in two- and four-stroke gasoline-fueled engines.
- Just one treatment reduces engine knock, improves ignition and helps fuel burn cleaner.
- Most users find one 12-ounce (354 mL) bottle for 15 gallons (57 litres) of gasoline provides the ideal performance increase.
EXCELLENT LEAD SUBSTITUTE
- Excellent as a lead substitute in collector automobiles, older off-road equipment and pleasure vehicles.
-
-
-
star rating
Buy NowBy Pontiac, a Verified Buyer from DC on April 25, 2026I purchased three products from AMSOIL, The Upper Cylinder Lubricant Corrosion Inhibitor, The DOMINATOR® Octane Boost, and The P.i.® Performance Improver Gasoline Additive I added all three to a full tank but, prior to doing this, I had filled the tank with Top Tier Fuel for this test Shortly after I took a ride, at first, I noticed nothing, but the very next day I put twenty miles on her, and that is when I noticed she ran quieter, and that the pick-up was back I highly recommend this product for older vehicles, and I want you to know, that these products are not a gimmick Check it out for yourselfBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
For Off Road UseBy WOODY, a Verified Buyer from North Carolina on January 17, 2026Using this product sparingly, has increased my power and mileage.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Feel the powerBy SHAWN, a Verified Buyer on January 10, 2026You can feel the power the vehicle loves itBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Major power improvementsBy CHARLES, a Verified Buyer from spruce grove on December 07, 2025Added to my mid grade gas i use at local station, its like running 94 octane fuel at half the price.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
This is a great Octane Boost productBy Moonshine455, a Verified Buyer from VT on September 13, 2025I use this in my Arctic Cat 1100 snowmobile on every tank refull - just an ounce or two and the throttle response difference is noticeable!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
MixedBy WOODY, a Verified Buyer from NC on September 02, 2025Mixed this Booster with lower octane fuel for my vehicles and the performance is noticeable. I understand that it is for off road use, but if you use it at a lower percentage than it calls for, you get great results.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
This stuff be boostinBy TRAVIS, a Verified Buyer from NY on August 06, 2025This stuff be boooooostin!!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Hold on.By TOM, a Verified Buyer from Las Vegas NV. on July 06, 2025Now this octane booster. Whoa. This stuff does work miracles. The power. The boost, I mean, you can't beat it. Another great product of Amsoil. And I love it. You guys need to try it.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great productBy SCOTT, a Verified Buyer from Minnesota on June 15, 2025My Genesis GV70 is turbocharged and requires above standard octane fuel lest the computer backs down the settings and thus performance. Problem gone when using Octane Boost. And my fuel economy increased between 6-10 percent as well. I'll keep using Octane BoostBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great supplementBy T L, a Verified Buyer from Texas on June 05, 2025A must for any Corvette that runs on premium pump gas! Huge difference in performance.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Data Bulletins-
- Increases octane up to 4 numbers for improved performance
- Maximizes power
- Reduces engine knock
- Improves ignition & responsiveness
- Helps fuel burn more cleanly
- Removes carbon deposits
-
We offer easy returns for customers. If your product is unused and unopened, you may return it within 30 days for a full refund of the purchase price. View full AMSOIL Return Policy.
-
We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.
-
For off-road and racing use only. Increases octane up to four numbers. Helps reduce engine knock for maximum power, responsiveness and performance.
See the product data sheet for full details.
INCREASES OCTANE UP TO 4 NUMBERS
- Significantly increases engine response and power in two- and four-stroke gasoline-fueled engines.
- Just one treatment reduces engine knock, improves ignition and helps fuel burn cleaner.
- Most users find one 12-ounce (354 mL) bottle for 15 gallons (57 litres) of gasoline provides the ideal performance increase.
EXCELLENT LEAD SUBSTITUTE
- Excellent as a lead substitute in collector automobiles, older off-road equipment and pleasure vehicles.
-
-
-
star rating
Buy NowBy Pontiac, a Verified Buyer from DC on April 25, 2026I purchased three products from AMSOIL, The Upper Cylinder Lubricant Corrosion Inhibitor, The DOMINATOR® Octane Boost, and The P.i.® Performance Improver Gasoline Additive I added all three to a full tank but, prior to doing this, I had filled the tank with Top Tier Fuel for this test Shortly after I took a ride, at first, I noticed nothing, but the very next day I put twenty miles on her, and that is when I noticed she ran quieter, and that the pick-up was back I highly recommend this product for older vehicles, and I want you to know, that these products are not a gimmick Check it out for yourselfBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
For Off Road UseBy WOODY, a Verified Buyer from North Carolina on January 17, 2026Using this product sparingly, has increased my power and mileage.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Feel the powerBy SHAWN, a Verified Buyer on January 10, 2026You can feel the power the vehicle loves itBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Major power improvementsBy CHARLES, a Verified Buyer from spruce grove on December 07, 2025Added to my mid grade gas i use at local station, its like running 94 octane fuel at half the price.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
This is a great Octane Boost productBy Moonshine455, a Verified Buyer from VT on September 13, 2025I use this in my Arctic Cat 1100 snowmobile on every tank refull - just an ounce or two and the throttle response difference is noticeable!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
MixedBy WOODY, a Verified Buyer from NC on September 02, 2025Mixed this Booster with lower octane fuel for my vehicles and the performance is noticeable. I understand that it is for off road use, but if you use it at a lower percentage than it calls for, you get great results.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
This stuff be boostinBy TRAVIS, a Verified Buyer from NY on August 06, 2025This stuff be boooooostin!!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Hold on.By TOM, a Verified Buyer from Las Vegas NV. on July 06, 2025Now this octane booster. Whoa. This stuff does work miracles. The power. The boost, I mean, you can't beat it. Another great product of Amsoil. And I love it. You guys need to try it.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great productBy SCOTT, a Verified Buyer from Minnesota on June 15, 2025My Genesis GV70 is turbocharged and requires above standard octane fuel lest the computer backs down the settings and thus performance. Problem gone when using Octane Boost. And my fuel economy increased between 6-10 percent as well. I'll keep using Octane BoostBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great supplementBy T L, a Verified Buyer from Texas on June 05, 2025A must for any Corvette that runs on premium pump gas! Huge difference in performance.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
