P.i. Performance Improver (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.
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Package sizes include:
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
• 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
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
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
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.
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
DANGER: Combustible. Harmful or fatal if swallowed. Harmful if inhaled. Skin and eye irritant. Read precautions
on container before use.