Skip to main content

Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity

I've searched the forums and it seems that people choose the Amsoil filter over PureONE on 'faith' that the Amsoil brand is somehow better than every other brand.

After checking the specs for the Amsoil EAO filter and the Purolator PureONE filter I found something shocking... PureONE is actually better by the numbers.

According this this website:

Amsoil tested their EAO with the industry standard ISO 4548-12 and found that the 15 micron efficiency to be 98.7%

PureONE's ISO 4548-12 for 5 micron is 50%, 10 micron is 92.8%, 15 micron is 99.2%, and 20 micron is 99.9%. [info source: e-mail response from the tech/engineer department].

I've e-mailed Amsoil about the 5/10/20 micron ratings that isn't listed on the website but it would seem that PureONE is better than Amsoil by the 15 micron comparison.

So... PureONE's filter is not recommended for 25,000miles oil change but Amsoil's EAO is by what logic? I guess if you trap more particles you have to change out the filter more often which means that the Amsoil one is probably letting more things through so it doesn't clog up and go into by-pass valve mode.

Any thoughts?

BTW, there was a thread about "Which is the Best Oil filter" in 2004. Back then Amsoil didn't have the EAO and people claimed that the Amsoil's SDF filter is a better choice than the PureONE. Amsoil claims that the EAO is MUCH more superior than the SDF. PureONE's numbers are a bit better than Amsoil's EAO (@15 micron so far at least). So... SDF>PureONE how?

This sort of support is similar to those who change over to cone air filters and say that there is 10-15hp increase by just putting on a filter. Did they dyno? No. They only had the 'butt' dyno claim when in reality if you do not tune rest of the intake exhaust system you will get at most 1-2hp and sometimes lose hp if you didn't heatshield the filter correctly from the engine bay heat.

Last edited {1}
Original Post

Replies sorted oldest to newest

The only issue that I could forsee a problem with PureOne filter is the limited flow capability after it filters the oil for a while. Depending on the bypass valve differential setting, it could go into bypass mode faster than the EaO, depending again on the amount of crud and crap in the engine crankcase.

That being said, I have used just about every brand out there at one time or another, and the only ones I stay away from are the super el-cheapo no name ones that you can tell as soon as you look at them that they aren't going to filter much.

As much as I like the construction and figures of the EaO, the PureOne seems like a much better "deal" with filtration though. Right now, I have on Royal Purple filters (don't go there!), as they looked pretty decent in construction, but are a little more pricey than the PureOne.

In the end, it's whatever will make you happy that will win the filter battle that goes onto your engine block.
I did not read that test. But I would like to believe that the mobil filter is not a better choice than the Ea filter. I run them on both my vehicles and boat, and really liked the added piece of mind. I remember reading older filter tests with the Mobil 1 filters, and the old SDF amsoil filters, I vaguely remember the pureone being slightly better than the mobil filter? but can not remember for sure. Do you have a link to that?
AMSOILS Ea oil filters efficiency ratings are "ABSOLUTE" PureOne is nominal. There is a big difference. Amsoil Ea filter are Absolute at 15 micron, meaning catching all contaminates at 15 micron.

PureOne is nominal at 15-20 microns meaning it will catch only 50% of these contaminates.

PureOne may show 99.9% efficiency rating but its at Nominal. The Ea is 98.7& but it's Absolute.
Also on the PureOne site it shows the efficiency rating at 20 micron at testing. Also see no mention of it being a Absolute efficiency rating, unless I missed something. It also does not have a guarenteed 25,000 mile / 1 year change interval.

The nanofiber technology of the filtration media used in the Ea oil filters is a Donaldson patent, and only is used in the Amsoil Ea and Donaldson Endurance oil filters, which are rated Absolute efficiency.
so what exactly is the 25,000 1/yr guarantee mean? What are they guaranteeing? I know amsoil makes excellent products, but their SS0 oil is states a service life of 35,000 miles or a year, or severe of 17,500. I really have not seen any uoa with that type of mileage on a normal vehicle. The higher uoa tend to show that it is a very good oil, but sometimes I wonder what they base their claims off of.
attend Reliable Plant 2024
Link copied to your clipboard.