AMSOIL P.i. Performance Improver Gasoline Additive
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P.i. Performance Improver Gasoline AdditiveHelp

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
 
4.8

(based on 86 reviews)

Ratings Distribution

  • 5 Stars

     

    (76)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (1)

94%

of respondents would recommend this to a friend.

Most Liked Positive Review

 

PI Fuel Maintenance

I have used this product in all my vehicles a few times a year at fuel fill-ups. I use top tier gasolines, but short drive habits and traffic congestion are problematic to deposit...Read complete review

I have used this product in all my vehicles a few times a year at fuel fill-ups. I use top tier gasolines, but short drive habits and traffic congestion are problematic to deposit buildup. I product focuses on fuel system performance unlike so many that say you can put the same product in your gas tank and in your engine oil. That just sounds like bad plan.

VS

Most Liked Negative Review

 

Not convinced it did anything

Put it in gas as per directions, drove it around in my 2012 work van, 140,000km. Normal average consumption is 11.8 to 12.4L/100km, and I fell in that range for the treatment...Read complete review

Put it in gas as per directions, drove it around in my 2012 work van, 140,000km. Normal average consumption is 11.8 to 12.4L/100km, and I fell in that range for the treatment tank, and the following tank. Can't say if it cleaned anything out, but I can say it didn't help mileage.

Reviewed by 86 customers

Displaying reviews 1-10

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5.0

PI GAS ADDTIVE

By 

from livonia michigan

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

PUT IT IN TWICE YEAR IN A FULL TANK.
AND NEVER HAD A PROBLEM STARTS GOOD
IN ANY WEATHER HOT & COLD WET OR DRY

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • ALL KINDS
 
4.0

I'll be buying all AMSOIL products from now on.

By 

from Jacksonville, NC

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

I've used the products and can only hope they work as advertised and from on-line reviews. Right now the jury's still out.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Jeep, Durango & Dodge pickup
 
5.0

Just works

By 

from Southern California

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

This always makes the car run more smooth and better feeling acceleration and general improvement overall

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Crz CT200h V8 explorer
 
5.0

NOT snake oil!

By 

from Albert Lea, MN.

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

Hey! This stuff works! I'm able to monitor multiple points on engine performance as I'm driving. I can see the process of cleaning dirty injectors as I'm traveling down the road, and it does as advertised.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • '08 Toyota FJ Cruiser
 
5.0

All fuel systems should be cleaned.

By 

from Ocoee, FL

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

All fuel systems should be cleaned from time to time as preventative maintenance. No matter how good your fuel is your system can get various deposits throughout it thus negatively affecting the fuel systems performance and fuel milage. This product lived up to its claims in my vehicle and will be used as needed in all of my vehicles.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2000 Jeep Grand Cherokee Laredo 4.0
 
5.0

I'm going to buy more

By 

from Seattle

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

I'm very happy with this product and will ordering more soon

  • How would you describe yourself?:
  • I'm a DIY handyman
 
5.0

Addding performance to my Cars

By 

from Lake Villa, IL

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

I've been using AmsOil synthetic oil and oil filters for a while now on my cars and also add the P.I. gas additive now and then just to give it a boost. I noticed using the PI additive is much better than other similar products and I don't have to use them too often. Once or twice a year helps keep the cars performing.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2017 Subaru WRX, 2008 Toyota Sequoia
 
5.0

Great product

By 

from Jefferson City, MO

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

Does what it says on the bottle!! Great product.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2004 Chevy truck

(1 of 1 customers found this review helpful)

 
5.0

I have used this product for many years...

By 

from Ft. Walton Beach, FL

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

I have used this product for many years in all of my cars, trucks, and motorcycles. During that time I have never experienced a fuel-related problem. I get flawless engine performance, increased fuel mileage, and NO trips to the repair shop for dirty fuel injectors.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • SUV, truck, and motorcycle
 
5.0

Best stuff you could buy.

By 

from Manteca, CA

Verified Buyer

Comments about P.i. Performance Improver Gasoline Additive:

Simply put it in your tank, fill it up with proffered gasoline, and drive off.
Cleans your system and improves mpg' garunteed. ITS ON THE BOTTLE.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • 2007 Chevrolet Cobalt Coupe

Displaying reviews 1-10

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