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P.i. Performance ImproverConcentrateAMSOIL P.i. improved fuel economyby reducing port fuel injector deposits,intake valve deposits and combustionchamber deposits in 100% of thevehicles tested.

Untreated Fuel Leads to Poor Engine Performance

A vehicle demonstrates its best efficiency and engine perfor-

mance when it is new. As the engine ages, its performance

suffers from gasoline-generated deposits that form on the fuelinjectors, intake valves and combustion chamber. Additives arerequired 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. ranks among the most potent gasoline additivesavailable today. As a concentrated detergent, it is outstanding

in cleaning combustion chamber deposits, intake valve depos-its 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 accumulateddeposits, testing showed AMSOIL P.i. provided the following

clean-up benefits after only one tank of gasoline:

• Improved 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.

Maximum Deposit Clean-up

Port Fuel Injector Deposits form after theengine has been shut down and there is nogasoline flowing through the injectors. During

this “hot soak” period the injectors heat upand 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 inject-ors are extremely tight and injectors must

deliver precise amounts of atomized fuel,

even small amounts of deposits cancause injectors to malfunction. Fuel flow

is reduced and spray patterns are dis-rupted, decreasing engine efficiency,

power and fuel economy, while increasingexhaust emissions.

D A T A B U L L E T I N

Injector spray pattern beforeP.i. treatment.

Injector spray pattern afterP.i. treatment.

Intake Valve Deposits form on the intake side or back sideof the valves. As deposits increase, they restrict airflow and

alter airflow patterns in the cylinder. The deposits disrupt thebalanced 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 seatingand the valves may be burned. Intake valve deposits cause

lost engine power, increased emissions, poor engine efficiencyand potential valve failure.

Two of the four dirty injectors tested were fouled >15% and anotherwas fouled >10%. After one tank of operation on AMSOIL P.i., all injectorsreturned to >95% flow.

75

85

95

105

   %    F

   l  o  w

Total Test Miles

1000 2000 3000

Build-up Clean-up

with P.i.

PASS

Test Method: CARB

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AMSOIL INC., 925 Tower Ave., Superior, WI 54880 • 715-392-7101 • Printed in U.S.A.© 2010, AMSOIL INC. All rights reserved. The AMSOIL logo is a registered trademark of AMSOIL INC.

Contact your AMSOIL Dealer for more information on AMSOIL products or to place an order. You may alsoorder direct by calling AMSOIL INC. at 1-800-956-5695 and providing the referral number listed here. 

Referral #_________________________________

G1135 11/1

Intake valve before

P.i. treatment.Intake valve after

P.i. treatment.

Combustion Chamber Deposits form on the top of the pistons

and on the cylinder heads. They increase compression and ab-sorb 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 cylinderhead. This is referred to as combustion chamber deposit inter-

ference or “carbon rap.” Combustion chamber deposits alsoflake 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 intakefresh charge temperatures and the increased likelihood of

pre-ignition “knock” or “pinging” when the fuel spontaneously

combusts prior to spark ignition. This increases emissions andmay cause engine damage. Many of today’s cars have “knock”

sensors that adjust spark timing to prevent knock. Although

AMSOIL P.i. averaged 72% intake valve deposit cleanup across a wide rangeof engine types and sizes, with two cars cleaning up greater than 90%.

AMSOIL P.i. averaged 46% combustion chamber deposit cleanup across a widerange of engine types and sizes, with four cars cleaning up greater than 50%.

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 isrestored, 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 remov-

ing fuel system deposits and other contaminants for improvedpower 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 isnot recommended. Treat gas every 4,000 miles of service (or

100 hours for marine, stationary and off-road gasoline-poweredengines). 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 and10 percent ethanol blended gas. Not recommended for two-

cycle engines.

DANGER: Combustible. Harmful or fatal if swallowed. Harmfulif inhaled. Skin and eye irritant. Read precautions on container

before use.

Pistonbefore

P.i.treatment.

Pistonafter

P.i.treatment.

Combustionchamberbefore

P.i.treatment.

Combustionchamberafter

P.i.

treatment.

AMSOIL P.i. provided an average fuel efficiency increase of 2.3%, with one carshowing improved fuel efficiency of 5.7%.

0

  1  9  9   7    H  o  n  d  a

  2 .  2   L   A  c  c  o  r  d

  1  9  9   7   J  e  e  p   4 .  0   L

  G  r  a  n  d   C   h  e  r  o   k  e  e

  1  9  9  8    F  o  r  d   4 .  0   L

   E  x  p   l  o  r  e  r

  1  9  9  9    T  o  y  o   t  a

  1 .  8   L   C  o  r  o   l   l  a

  1  9  9  9    T  o  y  o   t  a

  2 .  2   L   C  a  m  r  y

  1  9  9  9   O   l  d  s  m  o   b   i   l  e

  3 .  1   L   C  u   t   l  a  s  s

  2  0  0  2   C  a  d   i   l   l  a  c

  4 .  6   L    D  e  v   i   l   l  e

200

400

600

   I  n   t  a   k  e   V  a   l  v  e   D  e  p  o  s   i   t  s   (  m  g   /  v

  a   l  v  e   )

75%Cleanup

53%Cleanup

36%Cleanup

98%Cleanup

91%Cleanup

76%Cleanup

70%Cleanup

58

12

414

193212

135

48

1

61

5

249

59

115

34

Test Method: Motored Dyno D5500 Type Road Simulation Cycle

Test Method: Motored Dyno D5500 Type Road Simulation Cycle

10

  1  9  9   7    H  o  n  d  a

  2 .  2   L   A  c  c  o  r  d

  1  9  9   7   J  e  e  p   4 .  0   L

  G  r  a  n  d   C   h  e  r  o   k  e  e

  1  9  9  8    F  o  r  d   4 .  0   L

   E  x  p   l  o  r  e  r

  1  9  9  9    T  o  y  o   t  a

  1 .  8   L   C  o  r  o   l   l  a

  1  9  9  9    T  o  y  o   t  a

  2 .  2   L   C  a  m  r  y

  1  9  9  9   O   l  d  s  m  o   b   i   l  e

  3 .  1   L   C  u   t   l  a  s  s

  2  0  0  2   C  a  d   i   l   l  a  c

  4 .  6   L    D  e  v   i   l   l  e

15

20

25

   U   S   0   6   F  u  e   l   E  c  o  n  o  m  y   (  m  p  g   )

5.7%Increase

0.7%Increase

1.2%Increase

3.7%Increase

2.1%Increase

1.6%Increase

1.1%Increase

                2                2

    .                8 

30

35

                2                4

    .                1

                1                6 

    .              7

                1                6 

    .                8 

                1                6 

    .              5 

                1                6 

    .              7

                2              5 

    .                8 

                2                6 

    .                8 

                2                3 

    .                9 

                2                4

    .                4

                2                2

    .                6 

                2                2

    .                9 

                1                8 

    .                1

                1                8 

    .                3 

Test Method: Motored Dyno D5500 Type Road Simulation Cycle

0

  1  9  9   7    H  o  n  d  a

  2 .  2   L   A  c  c  o  r  d

  1  9  9   7   J  e  e  p   4 .  0   L

  G  r  a  n  d   C   h  e  r  o   k  e  e

  1  9  9  8    F  o  r  d   4 .  0   L

   E  x  p   l  o  r  e  r

  1  9  9  9    T  o  y  o   t  a

  1 .  8   L   C  o  r  o   l   l  a

  1  9  9  9    T  o  y  o   t  a

  2 .  2   L   C  a  m  r  y

  1  9  9  9   O   l  d  s  m  o   b   i   l  e

  3 .  1   L   C  u   t   l  a  s  s

  2  0  0  2   C  a  d   i   l   l  a  c

  4 .  6   L    D  e  v   i   l   l  e

3

6

9

25%Cleanup

40%Cleanup

51%Cleanup

63%Cleanup

56%Cleanup

30%Cleanup

55%Cleanup

2.8

12

15

3.9

2.6

2.4

3.6

4.9

2.2

2.9

1.8

3.1 1.8

0.8

2.5

4.81.9

0.8

5.7

6.9 3.9

1.7

2.4

2.5

1.6

1.8

5.5

6.7 4.1

1.4