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The "name of the game", as it is said, is to keep ALL dirt out of your engine. By doing that your engine may last three of four times as long as one would normally expect an engine to last. Detroit engineers tell us the dirt that actually does the MOST damage to an engine is between 5 and 20 microns in size. Most conventional (paper and other types of material) filters will only filter out dirt particles as small as 18 to 30 microns in size. Since about 80% of the dirt that ends up in your engine comes through the air intake system, that's a great deal of dirt that's getting through.
Your engine "breathes" air to mix with fuel for combustion -- about 9,000 gallons of air for every one gallon of gas. And there is a lot more dust and grit in the air than is generally realized -- over 400 tons of suspended dirt in a cubic mile of air over a typical city; and the concentration can be much higher in rural areas where there is frequent travel over unpaved roads
As an example, on the older carbureted engines, have you ever taken the air filter housing off and felt down inside the carb? If you were to wipe you finger around the inside you would find a lot of dirt and dust sticking to the side of the carburetor. If that much dirt sticks to the side of your carb how much do you think went down inside the engine?
The air filter is the first line of defense against the abrasive airborne grit that can cause serious damage inside your engine. But in order to do the job right, an air filter must effectively filter the dangerous particles out of the incoming air without obstructing the vital flow of air that is sustaining the engine.
AMSOIL INC. of Superior, WI announces the introduction of a new premium, high efficiency air filter utilizing nanofiber technology with a four year/100,000 mile service life guarantee and superior air flow. Positioning itself to be a world class leader in filtration, the AMSOIL Ea Filter is incomparable in both design and performance.
In lab testing Ea media with nanofibers removed 5 times more dust than the average cellulose filter and 50 times more dust than the average wet gauze media. Ea media also has 3 times the airflow of cellulose filters and is equal to wet gauze filters at the very low 0.5 inches of restriction. The proprietary Ea media held 15 times more dust than the average wet gauze type filter. In short, AMSOIL Ea Filters offer superior performance in the three critical performance benchmarks of efficiency, flow and capacity.
For more info, click here for AMSOIL Ea Air Filters

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"Every time that I slide a feeler gauge between the rocker arms and valve tappets to check the intake/exhaust valve adjustments, I am amazed at the amount of AMSOIL that clings to the gauge - even after the engine has sat for 3 or 4 days without being run. It was a noticeable difference over the petroleum oil that would rapidly run back down to the crankcase. My findings have convinced me that there is no other oil good enough for my racing engine." Paul Anderson
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