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.
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.
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