The Original Synthetic Oil
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AMSOIL P.i. Performance Improver (API)
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P.i. Performance Improver Concentrate (API)
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. Reduces
noise from carbon rap and pre-ignition. Offers better
vehicle drivability and smoother operation.
Reformulated for greater potency
Package sizes include:
12-oz. Bottle
12-oz. Bottles (case of 12)

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.

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.

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.

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.
Copyright 2008 All Service Oil All Rights Reserved
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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 or 100 hours of service. 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.
To purchase AMSOIL products at Wholesales prices, click on the Preferred Customer Account or Dealer Account buttons to the left. A Wholesale account can save you between 20-25% off retail prices.
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