New AMSOIL Performance Improver (P.I.) Formulation Provides Unsurpassed
Fuel Economy and Performance
Today’s fuels vary in quality and additive treat levels from the
Although a certain level of detergent additive is required by law to be
formulated into gasoline, cost restrictions cause refineries to use low
quality additives in the lowest additive concentration (LAC), a level
insufficient to prevent deposit accumulation. Deposits accumulate on
fuel injectors, intake valves and combustion chambers within just a few
thousand miles, disrupting spray patterns, affecting electronic sensors
and causing a multitude of problems.
Fuel system deposits result in the following:
power and poor throttle response
drivability - surging, hesitation, stalling, rough idle
knocking (pinging) and rap
The newly formulated AMSOIL PI Performance Improver 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, eliminating the need for
expensive fuel injector cleaning procedures. It is ideal for use prior
to emissions inspections, and it helps maintain peak engine efficiency,
fuel economy, power and drivability in newer low mileage engines. In
engines with accumulated deposits, testing showed AMSOIL PI 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%
(HC) up to 15%
monoxide (CO) up to 26%
oxides (NOx) up to 17%
power and performance
need for costly higher octane fuel
noise from carbon rap and pre-ignition
The new PI formulation offers greater potency than the old formulation
and delivers extra benefits, including increased fuel economy
improvements, improved intake valve and combustion chamber cleaning and
Because it is recommended every 4,000 miles, rather than with every tank
of gas, the new PI formulation is also more convenient to use. Its new
smaller neck makes it easier to pour into the tank, and because the flip
top has been eliminated, leakage is minimized.
Unsurpassed Deposit Clean-Up
Injector spray pattern before PI
Injector spray pattern after PI treatment
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.
Two of the four dirty injectors tested were fouled >15% and
another was fouled >10%. After one tank of operation on
AMSOIL PI, all injectors returned to >95% flow.
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 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.
Intake valve Intake valve after
before PI treatment PI treatment
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 PI maximizes fuel efficiency by dissolving and removing fuel
system deposits and other contaminants for improved power and overall
performance. Although the new PI formulation costs slightly more per
bottle than the old formulation, its more powerful potency saves money
in the long run. For example, in a vehicle with a 20-gallon tank
receiving 20 miles per gallon, the new PI costs 15% less over the course
of 4,000 miles. The old PI formulation treated fuel at a rate of one
oz. per 10 gallons of gasoline. A vehicle receiving 20 mpg consumes 200
gallons of gas and 20 ounces of the old PI over 4,000 miles, equating to
a $9.81 suggested retail cost for the 20 ounces of PI necessary for
4,000 miles ($7.85 suggested retail per 16-oz. bottle when purchased by
the case). Similarly, only one 12-oz. bottle of new PI is recommended
per 4,000 miles of driving, equating to a suggested retail cost of $8.60
when purchased by the case. Additionally, old PI required an initial
clean-up dose of six ounces per 10 gallons of gas, further increasing
its cost. Owners of vehicles receiving less than 20 mpg save even more
by using the new PI formulation.
PI Product Improvements
combustion chamber clean-up
fuel economy improvement
powerful cleaning agents for better overall performance
Treat one full tank of gas every 4,000 miles or 100 hours of service.
One bottle treats 20 gallons of gas. Do not treat and run more than 40
gallons of gas per treatment. PI helps pass emissions tests. Treat gas,
run that tank and fill up again prior to test. Safe for use with
catalytic converters, oxygen sensors, oxygenated gas and 10% ethanol
blended gas. Ideally, PI should be poured into the tank prior to
filling it up with gas, but it will mix thoroughly when added after
fill-up through normal agitation from driving.