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Old 01-21-2010, 09:28 AM
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Oil Filters, Dissected

I found this on another forum that I'm on - the talk about oil filters in the other thread about the Hemi taking 8 qts of oil reminded me of it so I thought I'd bring the info over here. Not sure if this is the best place for it to be posted - so if a mod feels it'd serve its purpose elsewhere, feel free to move it!

Oil Filters - Dissected

I was wondering what the differences were between some of the current oil filters. The study done at Engine Oil Filter Study is quite dated. So, I bought some oil filters from the local stores, grabbed my hacksaw and away I went. All filters had an anti-back flow gasket.






Findings:

The basic Fram is still crap. Fewest pleats and therefore least amount of filter area. Cardboard end-caps.


The TG Fram is better. Still has cardboard end-caps but has 15% more filter media and a screened by-pass valve.


The XG Fram is, can't believe I'm saying this, a decent filter. This is the only filter tested that used a different type of filter media. It was more fiberglass in nature vs. paperish for all the rest and is supported with a metal mesh. So even though it has less area, it is 2-3 times as thick.




STP and SuperTech are the exact same filter. Decent filter area but cheaply made and the felt end caps detached from the filter media with frightening ease. No by-pass valve.


Mopar and Purolator PremiumPlus are the exact same filter. Plenty of filter media with metal end caps which are impossible to remove from the filter media as seen by the dead Mopar filter.


Purolator PureOne and Bosch are the exact same filter. Largest amount of filter media with metal end caps which are also impossible to remove from the filter media.


All four of the latter are made by the same manufacture with the only difference between the two sets is the Mopar/Purolator PremiumPlus has the by-pass valve in the front, built into the stem..


...and the Bosch/Purolator PureOne has the by-pass valve located in the back via a 45-speed record adapter spring thingy along with 4 more pleats of filter media. Also, the PureOne has the best paint job. A nice royal blue w/ pearl coat


The Wix and NAPA Gold are the same filter but the NAPA Gold had 4 more pleats (61 vs 57) than the Wix. Was this by design or was it a machine assembly variance, probably the latter since everything else was exactly the same. The filters were similar to the Mopar and the Purolator PremiumPlus but made by someone else. They had a similar stem based by-base which was not attached to the filter media but loosely sits in the end-cap without a gasket. The Wix and NAPA Gold also had the second least amount of filter media. They had metal end-caps with the filter media permanently attached.


The Mobil 1 and the K&N are exactly the same filter less the 1" bung thingy on the K&N. Both are heavy due to their thick bases and smaller inlet holes. They too had the stem based by-pass valve firmly attached to the end-cap but only had 55 pleats, the second fewest. It did have the deepest pleats which equals fifth in area and the filter media was slightly thicker than most. Had metal end-caps with the filter media permanently attached.


Here the #'s (sorted by price):
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Old 01-21-2010, 10:17 AM
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Re: Oil Filters, Dissected

Good info!!! Just I can't find the oil filter for my 09 3.7 WK anywhere but the dealer. The fram filters have too small of an opening and doesn't fit to screw on.
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Old 01-21-2010, 11:52 AM
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Re: Oil Filters, Dissected

Interesting post. I have been using the Mopar filters for years. Seems like that wasn't a bad choice.
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Old 01-21-2010, 01:05 PM
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Re: Oil Filters, Dissected

your findings confirm that the mopar filters are made by purolator, i had only heard this as a rumor. thanks for the info, i am going to continue with the mopar filters due to these results. +rep
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Old 01-21-2010, 01:13 PM
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Re: Oil Filters, Dissected

Quote:
Originally Posted by SvenskaJeepGuy View Post
your findings confirm that the mopar filters are made by purolator, i had only heard this as a rumor. thanks for the info, i am going to continue with the mopar filters due to these results. +rep
Why not buy the Purolator if it is a buck cheaper?

Thank for the rep BTW!
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Old 01-21-2010, 02:49 PM
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Re: Oil Filters, Dissected

because the mopar is cheaper for me. i get a big discount for buying them a case at a time.
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Old 01-21-2010, 04:32 PM
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Re: Oil Filters, Dissected

So the k/n is just "meh"?

I'll try Mopar next time.
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Old 01-21-2010, 08:01 PM
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Re: Oil Filters, Dissected

what about royal purple filters?
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Old 01-21-2010, 08:41 PM
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Re: Oil Filters, Dissected

Someone at Champion Labs told me the Royal Purple filter is the best one they make. The guy didn't really elaborate on why he felt they were the best. Champion also makes the Mobil 1 and K&N filters. I would expect the RP filter to be very similar in design to those filters.
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Old 01-22-2010, 04:37 AM
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Re: Oil Filters, Dissected

Quote:
Originally Posted by White WK Swagga View Post
The fram filters have too small of an opening and doesn't fit to screw on.
This is a good thing... as you never want to use a Fram filter.
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Old 01-22-2010, 01:54 PM
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Re: Oil Filters, Dissected

I suspect that mopar and maybe others change their manufacturing sources, ie flipping from fram to purolator, every few years depending the best deal they get. even a filtering test is difficult to do because distributers change their manufacturing source. I expected to see some amsoil filter on here and a followup by an amsoil distributor about how their product is far superior, thankfully that didn't happen.

my suggestion is to buy from the OEM if you like their product.
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Old 01-22-2010, 02:00 PM
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Re: Oil Filters, Dissected

Based upon testing, Amsoil's EaO filters are supposedly very, very good.
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