Originally Posted by 47dodge

I use what I can find usually Mahle, but do have an Amsoil bypass filter also. This is rated at 2 microns.

Originally Posted by vox_incognita

Some Mann-Hummel info:
https://www.mann-hummel.com/mhuk/upload/doc/HBHCK_CtaRf.pdf

HU 951x(om606) ...HU 718/1k(om611 cdi )-99%separation efficiency at 38micron particle size.
........
And this is an older variant of the document.No mention of ISO 16 889 test yet.
http://www.mann-hummel.com.sg/EN/industrialfilters/doc/MANN%20Filters%20for%20Liquids.pdf

Originally Posted by Dave Donaldson

Cheers, I spent 10 years in R and D for a automotive parts supplier for fuel air and oil filtration systems. All testing and product development was done in accordance to SAE J 806 b, and JIS criteria.
On my 300 SDL 1987 I noted a 2 stage filter. pleated paper element, and a cotton element. Most paper elements, as per SAE the standard is 20 microns at 8 psi pressure differential across the media,, at this point the by pass kicks in and by passes the filter. My experience shows that as the filter media becomes more contaminated the ability to filter becomes greater, in regards to filtering smaller particles.. Since the 70's paper media has become known as depth type , thicker cross section,, meaning as the fibers swell with exposure to water it becomes tighter in terms of porosity. The same happens but much more in the cotton element. OEM requirements for our products were higher. The holding capacity, micron rating and ability to withstand pressure differential, {to prevent pleat collapsing and media migration } were more stringent.
We used AC fine dust from SAE spec. and it contained 2 to 200 micron particle size ,Millipore analysis was done and efficiency rate was normally in the 5 micron and 95% capture range but only in the last 50 % of the test. 8 to 10 hr test. contaminate feed rate of 2 grams per hour . So having babbled way too much,,I have done the following on all my vehicles one filter change every 2 oil changes,, and installed a K 55 partial flow filter cotton element that take 5 psi from oil gallery and returns it to sump,, also serves as oil cooler too . Verified that residual partial size is nominal 5 micron, and based on studies by the aviation industry, 5 micron will pass through bearing clearance with out adverse affects, as for rings to cylinder wear it is mostly a issue of end gap ..materials,, and surface finish. Water acids, and chemical formation and sludge are only cured by frequent oil changes. Cheers Dave D. caveat, applies only to autos not fleet / industrial and or stationary applications

Originally Posted by vox_incognita

The question is how long would it take for a om61X or om60x or a CR engine to clog the 2 micron filer media to such an extent to make the by-pass valve open permanently.I'd guess not very long.No thanks(unless I have a delta pressure gauge...which I dont).

Originally Posted by funola

Dave, I've been changing oil filter every other oil change also. What do you think of installing a pressure gauge before and after the filter to measure differential pressure and determine when to change the filter? What kind of readings should I be seeing on a new filter? At what reading should the filter be changed?

Originally Posted by Diesel911

But, I would think that if the differential pressure starts to rise at all that would be a good time to change the Filter.

Originally Posted by Diesel911

I do not understand this comment.
There is no part of the stock Filters that have a 2 micron Filter element....

Originally Posted by vox_incognita

Hm,I must have misread...I had the impression that someone was looking for the lowest micron rating to install in place of the stock one. Me wrong,sorry.

Originally Posted by funola

As the filter trap debri in the filter media, the differential pressure will start to rise. Are you saying the filter should be changed then?

Originally Posted by strelnik

I can't speak for what others want or look for, but I started this thread to find the best-filtering engine oil fulll-flow filter.

So far, it seems to be Baldwin unless a previous contributor would like to tell us what brand of filter provided the filtration in the 22 micron range.

Thanks!

Originally Posted by Diesel911

So far I have changed my Full Flow Oil Filter every time I change the Oil.

If I had the setup you were speaking of my personal choice would be to change the Filter as soon as I see that it is starting to plug up as indicated by a rise in the differential pressure.
I would not want to wait for a 20% drop in the Oil Pressure.

Originally Posted by Diesel911

I guess that clears it up for me.

Apparently it is impossible to have a 2 micron Full Flow Filter on a normal vehicle Engine.
If there was one the Filter Element would be huge and you still might have trouble moving cold Oil through it in the Winter.

In the pics you will notice that the Baldwin Oil Filter also appears to have a larger Full Flow Filter Element portion (on the bottom).
It is sad that the Baldwin/Hastings filter cost so much and is not available at a local Autoparts store.

Below is a pic of part of my By-pass Filter Element. I left it in for 2 Oil changes. (However, I did change the Stock Filter with each Oil Change.)

Clearly something is staying on the surface of the By-pass Oil Filter is not being Filtered by the Stock Oil Filter.