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AMSOIL P.i.® Performance Improver Gasoline Additive
Product code : APICN-EA
AMSOIL P.i.® Performance Improver Gasoline Additive
Product code : APICN-EA
Current price:
$18.99
Retail Price
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Estimated delivery by Mon, Jun 8
to Columbus - 43215.
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- Restores up to 14% horsepower1
- Restores GDI fuel injectors to 100% flow rate after one tank of fuel2
- Improves fuel economy
- Reduces need for costly higher-octane fuel
- Helps prevent carbon rap
- Controls pre-ignition knock
- Compatible with capless fuel systems
1Based on third-party testing in a 2016 Chevrolet* Silverado* 1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary.
2ASTM D5598(M) – 2013 Buick Regal test vehicle. -
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
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AMSOIL P.i. is a potent gasoline performance improver with concentrated detergent that aggressively cleans stubborn, power-robbing deposits from injectors, valves and the combustion chamber. Effective in port and direct injection systems. Bottle compatible with capless fuel systems. Cleans entire fuel system in one tank of gasoline. For use with cars and trucks. Treats up to 30 gallons. Add entire bottle to tank at fill-up. For best results, clean your fuel system with P.i. every 4,000 miles (6,400 km). Do not use with diesel or two-stroke engines.
See the Product Data Bulletin for full details.
MAXIMUM DEPOSIT CLEAN-UP
- Helps keep valves clean and moving freely.
- Aggressive additives attack the most common forms of engine deposits and limit their effects.
REMOVES FUEL-INJECTOR DEPOSITS
- P.i. removes deposits and keeps injectors functioning as they should.
- Testing shows P.i. restored GDI fuel injectors to a 100% flow rate after one tank of fuel.2
RESTORES HORSEPOWER
- Third-party testing demonstrated performance of P.i. using a 2016 Chevrolet* Silverado* with 100,616 miles on the odometer.
- Following a single treatment with P.i., the truck measured an incredible 14% improvement in horsepower.1
![Horsepower Comparison]( "Horsepower Comparison")
CLEANS COMBUSTION CHAMBER DEPOSITS
- Fights combustion chamber deposits to help restore power, control knock, increase fuel economy and reduce the need for higher-octane fuels.
- Protects against compression loss, difficulty starting and rough idling.
- Reduces possibility of "carbon rap," when deposit buildup causes the piston to hit the cylinder head.
- Decreases the possibility of pre-ignition "knock" or "pinging."
CAPLESS-COMPATIBLE BOTTLE
- Bottle is fully compatible with capless fuel systems.
1Based on third-party testing in a 2016 Chevrolet* Silverado* 1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary. 2ASTM D5598(M)-2013 Buick Regal test vehicle.
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star rating
It just works great!By DAVE, a Verified Buyer from Near Austin TX on June 01, 2026We have a 2014 Lincoln Navigator, and an 08 F150. I've been using this at least twice a year on both trucks. I don't track MPG, but I know that both trucks are running smoother than when we got them. In my mind, this is cheap insurance.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
PI gas additiveBy MELVIN, a Verified Buyer from Alberta on May 31, 2026No fuel problems and improved gas mileageBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
You need this in your truckBy THOMAS, a Verified Buyer from Las Vegas on May 29, 2026Ran PI in my 2016 5.0 f150 on a road trip with 93 borescoped my motor and so much cleaner, then changed my oil Amsoil 5-30 full syn I’m pushing 90 k on the OD and my baby runs clean. All Amsoil products have gotten me to 300 on OD on my fords I’ve owned!!! Freakin great stuffBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great Product!!By MATTHEW, a Verified Buyer from Cleveland, OH on May 28, 2026Legit Street Cars recommended this for any and all fuel system cleaning. I have a HIGHLY modified Audi RS3 on E85 that developed an idle misfire on cylinder 4. Within about ⅓ of a tank, the check engine light was off and has not come back since with 2 full tanks. This is probably the best for cleaning DI injectors out there. Highly satisfied with the additive.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Performance ImproverBy STEPHEN, a Verified Buyer from Scarborough on May 27, 2026I have seen many ads and have heard many reviews about this product. First time using this product and it has enhanced my vehicle performance.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Is It Working?By CHRISTOPHER, a Verified Buyer from Phoenix on May 17, 2026I added to all three cars with the idea that on DI, the inlet will be clean. I never w degradation - so no idea if it works. I'll give it as a recommendation for now and 4 stars. If I find evidence for improvement, I'll rank this as 5 stars. Cars are two 992.2 3.0L and an Explorer 3.0L.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great fuel system preventitiveBy DUSTIN, a Verified Buyer from New Mexico on May 12, 2026I use the P.I. every 5k miles in all of my vehicles to keep the fuel system working at peak performance. I know I get the results having pulled the fuel rail off my truck at 162k miles. All the fuel injectors were completely free of any carbon buildup and working like factory new!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Good stuffBy LARRY, a Verified Buyer on May 09, 2026Trusted brand works greatBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great productBy RICHARD, a Verified Buyer from Upland, CA on May 08, 2026I wish I'd known about this sooner! I only put about 75 miles a week on my car, stop and go to work and back. Bought my car used so I assume it already had some carbon buildup. Noticed quite a difference the first day! Will definitely use this once a year to keep it clean and responsive.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Pi with pea additive.By JAMES, a Verified Buyer from Dalton Ga. on May 08, 2026Best injector maintenance cleaner and combustion chamber cleaner on the market.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
WARRANTY-
- Restores up to 14% horsepower1
- Restores GDI fuel injectors to 100% flow rate after one tank of fuel2
- Improves fuel economy
- Reduces need for costly higher-octane fuel
- Helps prevent carbon rap
- Controls pre-ignition knock
- Compatible with capless fuel systems
1Based on third-party testing in a 2016 Chevrolet* Silverado* 1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary.
2ASTM D5598(M) – 2013 Buick Regal test vehicle. -
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.
-
AMSOIL P.i. is a potent gasoline performance improver with concentrated detergent that aggressively cleans stubborn, power-robbing deposits from injectors, valves and the combustion chamber. Effective in port and direct injection systems. Bottle compatible with capless fuel systems. Cleans entire fuel system in one tank of gasoline. For use with cars and trucks. Treats up to 30 gallons. Add entire bottle to tank at fill-up. For best results, clean your fuel system with P.i. every 4,000 miles (6,400 km). Do not use with diesel or two-stroke engines.
See the Product Data Bulletin for full details.
MAXIMUM DEPOSIT CLEAN-UP
- Helps keep valves clean and moving freely.
- Aggressive additives attack the most common forms of engine deposits and limit their effects.
REMOVES FUEL-INJECTOR DEPOSITS
- P.i. removes deposits and keeps injectors functioning as they should.
- Testing shows P.i. restored GDI fuel injectors to a 100% flow rate after one tank of fuel.2
RESTORES HORSEPOWER
- Third-party testing demonstrated performance of P.i. using a 2016 Chevrolet* Silverado* with 100,616 miles on the odometer.
- Following a single treatment with P.i., the truck measured an incredible 14% improvement in horsepower.1
![Horsepower Comparison]( "Horsepower Comparison")
CLEANS COMBUSTION CHAMBER DEPOSITS
- Fights combustion chamber deposits to help restore power, control knock, increase fuel economy and reduce the need for higher-octane fuels.
- Protects against compression loss, difficulty starting and rough idling.
- Reduces possibility of "carbon rap," when deposit buildup causes the piston to hit the cylinder head.
- Decreases the possibility of pre-ignition "knock" or "pinging."
CAPLESS-COMPATIBLE BOTTLE
- Bottle is fully compatible with capless fuel systems.
1Based on third-party testing in a 2016 Chevrolet* Silverado* 1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary. 2ASTM D5598(M)-2013 Buick Regal test vehicle.
-
-
-
star rating
It just works great!By DAVE, a Verified Buyer from Near Austin TX on June 01, 2026We have a 2014 Lincoln Navigator, and an 08 F150. I've been using this at least twice a year on both trucks. I don't track MPG, but I know that both trucks are running smoother than when we got them. In my mind, this is cheap insurance.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
PI gas additiveBy MELVIN, a Verified Buyer from Alberta on May 31, 2026No fuel problems and improved gas mileageBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
You need this in your truckBy THOMAS, a Verified Buyer from Las Vegas on May 29, 2026Ran PI in my 2016 5.0 f150 on a road trip with 93 borescoped my motor and so much cleaner, then changed my oil Amsoil 5-30 full syn I’m pushing 90 k on the OD and my baby runs clean. All Amsoil products have gotten me to 300 on OD on my fords I’ve owned!!! Freakin great stuffBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great Product!!By MATTHEW, a Verified Buyer from Cleveland, OH on May 28, 2026Legit Street Cars recommended this for any and all fuel system cleaning. I have a HIGHLY modified Audi RS3 on E85 that developed an idle misfire on cylinder 4. Within about ⅓ of a tank, the check engine light was off and has not come back since with 2 full tanks. This is probably the best for cleaning DI injectors out there. Highly satisfied with the additive.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Performance ImproverBy STEPHEN, a Verified Buyer from Scarborough on May 27, 2026I have seen many ads and have heard many reviews about this product. First time using this product and it has enhanced my vehicle performance.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Is It Working?By CHRISTOPHER, a Verified Buyer from Phoenix on May 17, 2026I added to all three cars with the idea that on DI, the inlet will be clean. I never w degradation - so no idea if it works. I'll give it as a recommendation for now and 4 stars. If I find evidence for improvement, I'll rank this as 5 stars. Cars are two 992.2 3.0L and an Explorer 3.0L.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great fuel system preventitiveBy DUSTIN, a Verified Buyer from New Mexico on May 12, 2026I use the P.I. every 5k miles in all of my vehicles to keep the fuel system working at peak performance. I know I get the results having pulled the fuel rail off my truck at 162k miles. All the fuel injectors were completely free of any carbon buildup and working like factory new!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Good stuffBy LARRY, a Verified Buyer on May 09, 2026Trusted brand works greatBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great productBy RICHARD, a Verified Buyer from Upland, CA on May 08, 2026I wish I'd known about this sooner! I only put about 75 miles a week on my car, stop and go to work and back. Bought my car used so I assume it already had some carbon buildup. Noticed quite a difference the first day! Will definitely use this once a year to keep it clean and responsive.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Pi with pea additive.By JAMES, a Verified Buyer from Dalton Ga. on May 08, 2026Best injector maintenance cleaner and combustion chamber cleaner on the market.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
