Fuel injection systems replaced carburetors in new vehicles in the 1980's due to the Environmental Protection Agency's (EPA) development of fuel economy and emissions regulations.  Fuel injectors allow more precise control of fuel delivery to the combustion chamber than carburetors, resulting in improved fuel efficiency and lower exhaust emissions.

For fuel injectors to work efficiently, they must be kept clean. Because engine performance suffers as fuel injectors become dirty, in the mid-1990's the U.S. government required all gasoline sold in the U.S. to be formulated with a lowest additive concentration (LAC) level of detergent additives to help keep engines clean and emissions under control. However, it takes a very low level of additive to pass the LAC tests, and most gasoline on the market contains as little as 123 parts per million (ppm) of additive.

The low levels of detergent additives in modern gasoline allow deposits to build up on critical fuel system components, and most motorists are unaware of how dirty the insides of their engines are until their vehicle's engine performance starts to deteriorate.

A properly formulated fuel additive will effectively clean everything it touches in a fuel system, including both port and direct fuel injectors, intake valves and combustion chambers, when added to a single tank of fuel.  With periodic use it will prevent deposits that build up over thousands of miles when the additive is not used.

Benefits of AMSOIL PI Performance Improver Gasoline Additive