AMSOIL P.i. Performance Improver Gasoline Additive
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P.i. Performance Improver Gasoline Additive Product Image
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$13.45 Retail Price (USD)
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Product Code: APICN-EA
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P.i. improves fuel mileage an average of 2.3% and up to 5.7%. Reduces emissions such as hydrocarbons (HC) up to 15%, carbon monoxide (CO) up to 26% and nitrous oxides (NOx) up to 17%. Restores power and performance. Reduces the need for costly higher octane fuel. (API)

Untreated Fuel Leads to Poor Engine Performance
A vehicle demonstrates its best efficiency and engine performance when it is new. As the engine ages, its performance suffers from gasoline fuel-generated deposits that form on the fuel injectors, intake valves and combustion chamber. Additives are required to control deposit formation.

Today’s fuels, however, lack sufficient treatments of either enough additives or high quality additives. Fuel system deposits result in the following:

  • Lost fuel economy
  • Lost power and poor throttle response
  • Failed emission tests
  • Poor drivability - surging, hesitation, stalling, rough idle
  • Engine knocking (pinging) and rap
  • Difficult starts

Treated Fuel Delivers Maximum Performance
AMSOIL P.i. is the most potent gasoline additive available today. As a concentrated detergent, it is unsurpassed in cleaning combustion chamber deposits, intake valve deposits and port fuel injector deposits. AMSOIL P.i. helps maintain peak engine efficiency, fuel economy, power and drivability in newer low mileage engines. In engines with accumulated deposits, testing showed AMSOIL P.i. provided the following clean-up benefits after only one tank of gasoline:

  • Improves fuel mileage an average of 2.3% and up to 5.7%
  • Reduced emissions
    • hydrocarbons (HC) up to 15%
    • carbon monoxide (CO) up to 26%
    • nitrous oxides (NOx) up to 17%
  • Restored power and performance
  • Reduced need for costly higher octane fuel
  • Reduced noise from carbon rap and pre-ignition
  • Better drivability
  • Smoother operation

AMSOIL P.i. works as an “emissions passer.” It is ideal for use prior to emissions inspections.

Unsurpassed Deposit Clean-up
Port Fuel Injector Deposits form after the engine has been shut down and there is no gasoline flowing through the injectors. During this “hot soak” period the injectors heat up and the gasoline remaining in the injectors degrades and forms deposits. This can happen very quickly with the use of poor quality gasoline and short trip driving. Because the clearances within the injectors are extremely tight and injectors must deliver precise amounts of “atomized” fuel, even small amounts of deposits can cause injectors to malfunction. Fuel flow is reduced and spray patterns are disrupted, decreasing engine efficiency, power and fuel economy, while increasing exhaust emissions.

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Intake Valve Deposits form on the intake side or back side of the valves. As deposits increase, they restrict airflow and alter airflow patterns in the cylinder. The deposits disrupt the balanced air/fuel ratio by momentarily absorbing and releasing fuel, and they can cause valve sticking by getting in the way of the valve stem and guide. Deposits also restrict proper seating, and the valves may be burned. Intake valve deposits cause lost engine power, increased emissions, poor engine efficiency and potential valve failure.

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Combustion Chamber Deposits form on the top of the pistons and on the cylinder heads. They increase compression and absorb heat during combustion to later release it during the intake cycle. In some engines with tight squish domes, combustion chamber deposits cause the piston to actually hit the cylinder head. This is referred to as combustion chamber deposit interference or “carbon rap.” Combustion chamber deposits also flake off as they get large, and these flakes can get trapped between the valves and valve seat, resulting in compression loss, difficult starting and rough idle.

Higher compression and stored heat cause increased intake fresh charge temperatures and the increased likelihood of pre-ignition “knock” or “pinging” when the fuel spontaneously combusts prior to spark ignition. This increases emissions and may cause engine damage. Many of today’s cars have “knock” sensors that adjust spark timing to prevent knock.

Although audible knock is controlled, power is lost from retarded timing. Higher octane fuels of 4-5 octane numbers can be used to help prevent knock, an effect called “octane requirement increase.”As a vehicle ages, more-expensive,
higher-octane fuel is needed to keep it operating at peak performance. By cleaning combustion chamber deposits, knock is controlled, power is restored, fuel economy increases and higher-octane fuels are less necessary for peak performance.

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Maximum Fuel Economy
AMSOIL P.i. maximizes fuel efficiency by dissolving and removing fuel system deposits and other contaminants for improved power and overall performance.

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Recommendations
Treat one full tank of gas up to 20 gallons with one bottle of P.i. For very large gas tanks, partially fill to 40 gallons and treat with two bottles of P.i. Using more than two bottles per treatment is not recommended. Treat gas every 4,000 miles of service (or 100 hours for marine, stationary and off-road gasoline-powered engines). P.i. helps pass emission tests by running one tank of treated fuel through the engine prior to testing. Safe for use with catalytic converters, oxygen sensors, oxygenated gas and 10 percent ethanol blended gas. Not recommended for two-cycle engines.

DANGER: Combustible. Harmful or fatal if swallowed. Harmful if inhaled. Skin and eye irritant. Read precautions on container before use.

API Package Sizes
Code Package Size Unit of Measure Product
APICN (APICN-EA) 12-Oz. Each P.i. Performance Improver Gasoline Additive
APICN (APICN-CA) 12-Oz. Case of 12 P.i. Performance Improver Gasoline Additive
More about AMSOIL Reviews

REVIEW SNAPSHOT®

by PowerReviews
AMSOILP.i. Performance Improver Gasoline Additive
 
4.9

(based on 137 reviews)

Ratings Distribution

  • 5 Stars

     

    (126)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (1)

97%

of respondents would recommend this to a friend.

Most Liked Positive Review

 

Awesome Fuel System Tx.!

I utilize the additive about once q. 3 mo. and I can definitely tell the difference in my wife's '08 Honda Accord 3.5L V-6. The MPG increases on HWY by about...Read complete review

I utilize the additive about once q. 3 mo. and I can definitely tell the difference in my wife's '08 Honda Accord 3.5L V-6. The MPG increases on HWY by about 5%! Amsoil should come out with an affordable Ethanol Tx. which counteracts the decrease in MPG/Power of ethanol blend gasoline. We strictly utilize BP gasolines, yet there is still carbon build-up even with the additives they possess. Definitely worth the price to help keep the fuel system flowing smoothly!

VS

Most Liked Negative Review

 

Just cheap insurance for fuel system

I am not sure if the product actually does much to improve the fuel mileage of my 6 cylinder Chrysler 200 but it does seem to run smoothly . I just use it when I...Read complete review

I am not sure if the product actually does much to improve the fuel mileage of my 6 cylinder Chrysler 200 but it does seem to run smoothly . I just use it when I change my oil and filter to help keep the fuel injection system clean. I figure if I'm gonna put in clean oil.and filter, might as well clean fuel system too!

Reviewed by 137 customers

Displaying reviews 1-10

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5.0

I would buy this again.

By 

from Excelsior Spring Mo

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

I use this in my 2003 Ranger Ford & my 2003 Explore. It keeps my intake clean and gave me more horse power too.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Ford Ranger
 
5.0

Yes I will buy this product again.

By 

from Sioux City, IA

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

I think Amsoil make top of the line products. I use this product in my vehicles every 4 to 6 months.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Truck, car & minivan
 
5.0

I would buy this again

By 

from Germantown MD

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

Fantastic

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Subaru
 
5.0

Have used it to good effect in all my cars

By 

from Hudson Florida

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

If used as directed it does a great job

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2017 Honda Civic turbo Hatchback
 
5.0

P.i. Gas Additive

By 

from Connecticut

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

Use this on both my vehicles every 5,000 miles and it seems to help keep injectors clean, running smoothly with smooth idling.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2012 VW GTI and 2017 VW Touareg
 
5.0

I buy all the time

By 

from Tucson Az.

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

motors that don't get used much put PI in smooths right out.buy it

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • cars motorcycles tractor gas tools
 
5.0

Smooth running

By 

from NH

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

This added 2 plus mpg, I really don't care about that, I want smooth running and clean burning

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2011 Hemi Ram
 
5.0

I would like to buy this product again again

By 

from Atlanta Ga

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

Good product thanks amsoil

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Kia Sorrento, Pontiac vibe ,Nissan alti
 
5.0

This stuff REALLY works

By 

from Henderson, NV

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

I put a bottle of this in my 2005 Chevy Avalanche every 5000 miles and between that and Amsoil Signature Series oil I use I have over 200,000 miles and it is still going strong!!

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2005 Chevy Avalanche, 2012 Nissan 370Z
 
3.0

Just cheap insurance for fuel system

By 

from PA

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

I am not sure if the product actually does much to improve the fuel mileage of my 6 cylinder Chrysler 200 but it does seem to run smoothly . I just use it when I change my oil and filter to help keep the fuel injection system clean. I figure if I'm gonna put in clean oil.and filter, might as well clean fuel system too!

  • How would you describe yourself?:
  • I'm a professional mechanic
  • What kind of vehicle/equipment do you have?:
  • 15 Chrysler 200c awd.

Displaying reviews 1-10

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