Oil filter flow vs. filtering efficiency

[996GT2]

I've noticed that Honda and Toyota's OEM oil filters have low rated filtering efficiency compared to some of the aftermarket options.

For example, the well-regarded Honda A01 (made by Filtech) is only rated for ~65% efficiency at 20 microns. Toyota's OEM filters have a similarly low rated efficiency. A PureOne is rated for 99.9% efficiency at 20 microns.

In the case of the Honda A01, it also has 40% more filter media than a PureOne (151 vs 108 square inches). So it would seem like Honda is going for a high flow rate with that much filter media + a low restriction, less efficient media.

Which brings me to the question...is using a high-efficiency (more restrictive) filter like a PureOne really a good idea when the OEM filters are mostly designed to favor higher flow?

 

[Jimzz]

Most change their oil so often it never comes into play so that is why some filters can get away with a little less efficiency and not have a problem.

But also make sure you are looking at the same ratings. There is single pass vs multi-pass. Plus the way they are tested. The only oil filters I stay away from are Fram. Its the only filter I have had fail on me as a user and/or a auto tech.