Air Filter products at Discovery Oil

The AMSOIL LT filter has been the best money could buy for years. No other air filter available could come close to this filter's overall performance.

AMSOIL, however, did not sit back and live on its past successes. That's not the way AMSOIL does business. AMSOIL spent years of research, let by AMSOIL Director of Research and Development David Anderson, developing an even better air filter design... the AMSOIL 2-STAGE Air Filter.

What Makes the 2-STAGE a Better Design
The AMSOIL 2-STAGE Air Filter is constructed of oil-wetted polyurethane foam wrapped around an expanded metal cage. The combination of these different density foams provides initial air flow characteristics very similar to the AMSOIL LT Air Filter, yet can trap and hold even more dirt without causing performance-robbing air restriction. This means the 2-STAGE Air Filter will give better air flow for a longer period of time while holding even more dirt. In fact, tests have proven that 2-STAGE Air Filter has 70-350% greater life expectancy than competitive air filters.

The 2-STAGE Air Filter is washable and reusable. Cleaning and servicing instructions for the 2-STAGE Air Filter are the same as the LT Air Filter. Each box contains complete servicing instructions, as does the AMSOIL Air Filter Product Data Bulletin (included with this issue of the ACTION NEWS).

The 2-STAGE Air Filter is constructed with high quality materials and expert workmanship. The reusable 2-STAGE Air Filter is designed to last indefinitely with proper service. Under normal driving conditions, it may be used for 25,000 miles or one year between servicing. Under dusty driving conditions, it should be cleaned and serviced more frequently.


	MINUTES INTO TEST Air filter performance as measured by the Society of Automotive Engineers (S.A.E.) Test Method J726C. This test evaluates a filter's dirt-holding ability while also measuring its corresponding restriction. During the test, 7.6 grams of test dust was added per minute. The results showed a 350% greater life expectancy with the AMSOIL 2-STAGE Air Filter.

Jim Bigley, author of The Diesel Page Website, put the AMSOIL, Two-Stage Air Filter to side-by-side testing with two other popular air filters. Bigley tested a K&N #1690 oiled gauze performance filter, an AC A644C paper filter with an oiled foam wrap and the AMSOIL TS-52. All three filters were tested as received.

Bigley collected a road dust sample and treated it to pulverizing and grain sorting processes used in geological sample preparation. He tested each filter with a mixture of road dust grain sizes; four ounces with grain size smaller than 0.0049 inches; one ounce with grain size between 0.0082 inches; and less than one ounce with grain size between 0.0082 inches adn 0.0098 inches.

Bigley used a vacuum assembly, rated at 540 CFM, to pull air through the airbox. To test filtering efficiency, he coated there 4"X4" ceeeramic plates with a very sticky tack oil and placed the plates inside the airbox on top of the fan cage so they could trap the particules that passed through the filter. He photographed each plate after test end.

Bigley reports, "K&N came in dead last in this test as expected. I expected the AC filter to do the best in the filtering efficiency test, but it came in just slightly (emphasis Bigley's) ahead of the K&N. Before testing the AC I didn't think anything could get through it, especially with [its] oiled foam wrap. The AMSOIL filter surprised me by winning this contest by a big margin. The advertising claim on the AMSOIL box which says, 'Proven Best for Removing Airborne Dirt' is no idle claim."

In his conclusion, Bigley reports, "From a filtering efficiency standpoint, the AMSOIL oiled foam filter element will protect your engine better than the other two style filters tested. No doubt about it."