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Amsoil PI Fuel Treatment Testimonials

A lot of testimonials have been exchanged recently on the new Amsoil PI Fuel Treatement that was released earlier this year.  I thought I’d pass on some of these as well as listing some more data on the products for those interested.  It’s not that it helps to gain power, but it helps to clean up your fuel system giving you the power and MPG that your car once had.  If you have a new car, you might not notice any changes, but if you have several thousand miles on it, there is a good possibility that you have some build up on your injectors that is no longer allowing them to function at their peak.

When Amsoil approached the company that developed the new PI formula, they were informed that some of todays injectors have up to 12 nozzles each, and these are about the size of a human hair.  It doesn’t take much to block some of these openings and no fuel system cleaner on the market was able to clean them. Amsoil asked if they could develop a formula that would, and to not worry about cost, like so many other companies’ bottom line is.  They said yes, and the new PI was developed and it is now flying out of the warehouses and the testimonials keep coming in.  Again Amsoil’s approach wasn’t ruled by cost, but by quality, and people are getting results from that quality.

Some of these may not be the most scientific, but they are real world from real drivers:


Sent: Tuesday, October 16, 2007 9:15 PM
Subject: PI,PI,PI,PI!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!THIS STUFF REALLY WORKS

Hey Guys,

Like everyone else I’m a big skeptic.So when I went to use the new reformulated (PI) Performance Improver I was only expecting some minimal savings on my gas per miles. Boy was I wrong. I own a 2001 Mazda MPV with a 2.5 lt. v-6 and for the last year I had been getting consistently 242 miles to my 15 or 16 gallon tank roughly about 16 miles per gallon. After the first use of PI I gained an extra 20 miles. On the next tank I ran some 300 miles to the same tank of gas. I couldn’t believe it. Although those 300 miles were highway miles I never got even close to that kind of mileage not to mention that the van was loaded with product driving to Lakeland. Under normal running in town though I estimate that I will be getting close to 40 miles more than what I had been getting for the last year. This stuff really works. Just thought I should share this with you guys.



Sent: Thursday, October 04, 2007 6:58 PM
Subject: Re: P.I. Testimonial

I sold the PI to my co worker for his 1995 Z28 (this car is seasonaly driven). Ever since he has owned the  car it has been babied. Last year it had an injector start to get plugged up, so he took it to the GM dealer. After a $450 injector sercvice bill the hesitation came back. This year I sold him a bottle of PI. The result happened within an hour drivethe hesitation was gone. The next tank of fuel it was better than the GM fix! And I got a promise that when he changes his oil it will be Amsoil!



Sent: Thursday, October 04, 2007 12:05 AM
Subject: P.I. Testimonial

A few months ago, Steve and I changed the oil on a 98 Heritage Softail for a customer we met at Biff Burger. Steve recently sold him some P.I.  (new version), and he put it in his 99 Sebring 6 cylinder.  It has the computer that calculates his mileage for him. Before the application of P.I., he was getting a solid 18 mpg around town.  With one tank of gas and the P.I., he got 23 mpg around town…..a 5 mpg increase! That’s a 27.7% increase in gas mileage!  Made my night. Thought you’d like to know.


P.i. Performance Improver Concentrate (API)

AMSOIL P.i. improved fuel economy by reducing port fuel injector deposits, intake valve deposits and combustion chamber deposits in 100% of the vehicles tested!

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.


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. P.i. 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. 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.


For those with diesel applications, we have a line of diesel fuel additives that we have also been getting good feedback on since they were released nearly a year ago.

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