Fram claims a 98 percent single pass efficiency for their filters. The Fram Tough Gard filter box claims, “Single-Pass Efficiency (SPE) of 98% is a measurement of the amount of 10-20 micron engine-damaging particles that are stopped by the filter with the first oil pass.” However, the particles under ten microns amount to about 57 percent of total particle weight.
One can see how misleading this can be. Sure, Fram filters may remove 98 percent of particles in the 10-20 micron range, but particles larger than ten microns only make up about 43 percent of the total particle weight. How well do they remove the smaller particles?
AMSOIL uses H 806 test parameters established by the Society of Automotive Engineers (SAE) when testing its filters, using Standardized Air Cleaner Test Dust composed of particles ranging in size from 0 to 80 microns. AMSOIL Super Duty Filters remove 94 percent of all particles.
Standardized Air
Cleaner Test Dust |
Micron
Size
Range |
Percentage
By
Weight |
Variance
Allowed
(2%) |
| 0-5 |
39% |
2% |
| 5-10 |
18% |
3% |
| 10-20 |
16% |
3% |
| 20-40 |
18% |
3% |
| 40-80 |
9% |
3% |
|
Designed to provide maximum filtration while meeting the high flow demands of modern automobiles, the SDF contains a special cellulose, synthetic and glass blend media that offers the best possible balance of long life, high capacity and overall efficiency. It's lofted fiber depth-type media traps dirt throughout its entire thickness, not just on the surface, for exceptional filtering efficiency. It keeps oil clean and free of wear-causing contaminants. The SDF provides up to 100 percent more capacity and up to 20 percent greater efficiency than other oil fitlers provide.
For an interesting and very enlightening independent assessment of oil filters on the market (albeit not a technical or scientific analysis), take a look at the following web page. Taken in context, it is an excellent read:
http://minimopar.knizefamily.net/oilfilterstudy.html
Fram claims a 98 percent single pass efficiency for their filters. The Fram Tough Gard filter box claims, “Single-Pass Efficiency (SPE) of 98% is a measurement of the amount of 10-20 micron engine-damaging particles that are stopped by the filter with the first oil pass.” However, the particles under ten microns amount to about 57 percent of total particle weight.
