2 things about that test that stand out when I read it. By the way here is a better link
to read the whole thing.
1. It used the old Amsoil filter known as the TS series, which was dual density (2 layered) oiled foam (DDOF). When the DDOF technology was tested with fine dust particles, it was shown as one of the best technologies at the time (again pre-2004). Also this is why you see DDOF technology used on 2 stroke stuff like hanheld equi,pment (string trimmers & leaf blowers) and many ATVs & dirtbikes, where smaller (fine) dirt particles are of larger concern. Amsoil discontinued the DDOF design in 2005 & replaced with our dry media filters known as the EA series. This new technology was a collaborative effort with Donaldson and is second to none in the industry.
2. If you do some real good research and look into what exactly what is tested in an ISO test you will find that they test COARSE
dust & fine dust, this test used COURSE
dust! Just because these guys had access to a $285,000 piece of test equipment, it doesn't make them scientists!
There are four things that count in air filtration:
flow volume, holding capacity, and filtration particle size at a specific efficiency.
- Flow Volume. Some companies focus exclusively on flow volume.
Three things to know:
- Flow volume at what pressure drop?
- What’s your engine’s maximum airflow? Any flow beyond what your engine can use is useless to you. In racing or pulling applications with modified vehicles, a high pressure drop (because of high air flow volume) can often collapse the filter. The engine-damaging results are expensive.
- Very low pressure drop at very high flow usually means that at least 50% of meaningful wear particles are passing right through into your engine.
- Holding capacity. How much particulate will the filter hold before the pressure drop across the filter is measureably reducing your fuel economy or power? In the case of oiled-cotton-gauze filters, how much particulate will the filter hold before it’s passing nearly all the wear particles into your engine? (The classic answer is “not much”.)
- Filtration Particle Size. The accepted rule of thumb is that damaging wear particles are those with a size of 5 to 25 microns. Filtering smaller ones is icing on the cake. Claiming filter performance efficiency on particles larger than 20 microns is a warning sign that the filter performance is very poor.
- Filtration Efficiency. This is listed as a percentage, which refers to what percent of a certain size of particles are captured by the filter. Beware: in order for either the particle-size or efficiency to have ANY meaning at all, you MUST know both numbers. Any company who quotes one without the other is simply trying to deceive you, and generally implies that their real performance in removing wear particles is average to poor.
Bottom line... What matters is that AMSOIL’s Ea line of nanofiber air filters is 98.7% efficient at 2 microns. According to an SAE research paper, that level of filtration reduces particle-based engine wear to levels so low that it is difficult to detect any wear.
What about certified ISO testing? That’s all legitimately potentially impressive, but “the devil’s in the details”. What’s the particle size at what efficiency percentage? They don’t tell you, so you have to figure it out. That’s pretty tough if you aren’t a trained engineer… and not very convenient for consumers!
So what does that mean? A couple of very important things.
First, “coarse” test dust is exactly that, and it’s not going to tell you much other than that you have a filter. It’s a good test of how well your filter will work in a baja race if you’re eating a lot of dust kicked up in front of you. But is that what you’re doing? If they really wanted to test and demonstrate meaningful performance, they would use “fine” test dust.
Secondly, it means that when they do comparison “side by side” “apples to apples” testing against a much better filter, like a nanofiber media, their filter performance can look very good – even identical. Because as the coarse dust builds up on their coarse filter, the classic “dust cake” forms, enabling the filter to take out much smaller particles than it otherwise could. If
they tested it with fine dust, the results would be very different.
AMSOIL doesn’t play games. Ea filters are tested with fine dust by the most respected certified filtration test lab in the nation, and they publish the particle size and efficiency together with flow and capacity data. They tell us everything, nothing hidden. No-one else does that. 15 times the dust holding capacity of oiled gauze filters, at an identical (very low) 0.5 inches of pressure drop. And just try to beat 98.7% at 2 microns. You won't find another filter to do that.
By the way, EAA filters are dry media, quickly cleaned, re-useable, and are also cheaper to use than any other air filter over the life of a vehicle, guranteed for 100,000 miles. This is the technology used in the M1A1 Abrams tank for more than a decade.