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Old 02-12-2013, 10:04 PM   #21
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Quote:
Originally Posted by midpack View Post
What makes a bigger filter better? I was surprised to find the same filter is used for a turbo 2.5l Subaru as our little 1.8. My new Nissan 4.0l v6 uses one that is only .59" taller with the same OD and it's even good for 7500m OCI. Are there any UOA reports that show a bigger filter provides better or longer lasting filtration?
As far as I understand a larger filter will make no difference from a performance standpoint. Where it does make a difference is extending your OCI for particulates. More 20 Micron filter material is more that can successfully filter before diverting all oil to bypass.

My POV is that it won't hurt, and the larger filter costs virtually the same as the smaller one. I believe the OE Miata filter is spec'd at 40 microns (at least in a Purolator). Upgrading to any of these filters will give you better filtration.

The best filters I've found through research are either the Amsoil or the Royal Purple filters with synthetic media. They are also right about $15-$20 each almost regardless of size. The Purolators I've found to be the best bargain. $5, 20 micron filtration, good case coating for grip, and readily available. Although they're now owned by Bosch, and I'm not really crazy about Bosch. Never got a good Bosch O2 sensor, and never get any of their plugs unless they were OE for your vehicle.

Wix cost a little extra, but are always high quality. IIRC, Napa Gold is whitebox Wix.

Edit: Oh, and it lets you put more oil into your system. More oil acts as a larger heatsink and could lead to lower oil temperatures, as well as the extra wear additives provided in the extra oil further extending OCI's.

Last edited by TheScaryOne; 02-13-2013 at 12:31 AM.
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Old 02-14-2013, 12:44 AM   #22
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Amsoil makes a standard and a larger filter for the Miata.
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Old 02-14-2013, 02:05 AM   #23
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I wouldn't assume a larger filter has more filtration media, not without cutting them open. I don't see anything on Purolator's site that states the PL14612 is a 40 micron filter. But that might be because all Purolator oil filters are 20 micron with the PureOne line catching more debris than the standard line.

If you're concerned about oil temp install a cooler, a bigger filter won't help with that.

Please post up your UOA results showing a difference in wear additives and contamination from running longer OCI intervals on stock vs larger sized filters.

I'm envious of those of you with convenient Napa locations, I use Purolators cause they are a great filter, reasonably priced and convenient. There's an Advanced in the same plaza as Oilmart and the happen to stock them.
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Old 02-16-2013, 05:49 PM   #24
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Quote:
Originally Posted by midpack View Post
I wouldn't assume a larger filter has more filtration media, not without cutting them open. I don't see anything on Purolator's site that states the PL14612 is a 40 micron filter. But that might be because all Purolator oil filters are 20 micron with the PureOne line catching more debris than the standard line.
Don't have any UOI's as my car burns a quart right about every 1000 miles.



Excuse the cell phone pic. They were getting antsy at the Pepboys. It said 40 micron on the 14612 as well. Went with the PL14459 again, as they didn't have the interchange from the Wix 51626 on the shelf.

Edit: Just saw that another pepboys does have it on the shelf. PL14619 will try exchanging on the way home tonight.
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Old 02-17-2013, 11:40 PM   #25
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Thanks for the pic. It would be really nice if they published this info on their website instead of trying to be deceitful and only listing the better specs of a pl30001.
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Old 12-08-2015, 01:42 PM   #26
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So I'm going to do my first oil change on my car after its 5,000km from Vancouver to Hamilton (3,100 Miles) despite being all highway at 80mph for the duration of a tank of gas a number of times in a row. I'd really like to try the large filter for a bit more oil capacity. Is anyone still using the big filter without issue? How well does the anti drain back valve work for the oil system? Diesel fuel doesn't get as hot as engine oil can. I wonder if the seals and such are happy at 200+ F.

I've used the Donaldson P551318...well for its intended purpose as a fuel filter. Never considered using it as an oil filter. It lists as a 9 micron filter per Donaldson's specs https://dynamic.donaldson.com/WebSto...63&item=742494

WIX lists it as 10 micron Wix 33403 & Napa 3403 Fuel Filter: FleetFilter Secure Store - Wix, Fram, Baldwin, Luberfiner

Filter Bags | Micron Size Comparison Chart | Clearstream Filters Inc. This is a handy reference chart for micron sizes.

My UWAG (uneducated wild *** guess) is that if a filter can catch particles down to 9 or 10 microns it would have a shorter service life vs a filter of the same size that can filter to 21 or even 40 microns. It would be interesting to see the particle count in the oil between 21 micron and 9 micron. My bet is there many more 9 micron particles and the larger 551318 filter might not have a much longer service life over the stock filter. The oil will stay much cleaner. I would love to do oil samples back to back with the same oil, change interval and driving conditions between a stock filter and the 551318. Then again I'm sure I will burn it off faster than anything to really matter.
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Old 12-08-2015, 03:20 PM   #27
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I ended up going with the Purolator PureONE part # PL14619 nice compromise for cost vs quality. I buy'im by the case.
Cheers,
- Jeff
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Old 12-08-2015, 03:31 PM   #28
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Quote:
Originally Posted by Eunn View Post
My UWAG (uneducated wild *** guess) is that if a filter can catch particles down to 9 or 10 microns it would have a shorter service life vs a filter of the same size that can filter to 21 or even 40 microns.
My UWAG would be that, as lubricating oil has a much higher viscosity than diesel fuel, a filter designed for diesel fuel would present a much greater restriction to flow under normal operation than one designed for engine oil.

Do diesel fuel filters even have internal bypass valves? If so, it's gonna spend a lot of time in bypass. If not, your oil pump's pressure reg valve will, and flow (especially when cold) will be greatly reduced, which is a far worse prospect.


Either way, I've never had a problem using oil filters to filter my oil. I'm not gonna be the first person who tries using a fuel filter in this application.


Just a WAG.
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Old 12-08-2015, 04:30 PM   #29
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+1 for the pureONE. Loved the grippy case.
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Old 12-08-2015, 05:29 PM   #30
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Eunn, will 7/8-14 still spin on the 20x1.5mm that we normally use? To the filters credit it does flow 12 gpm. I think it was Ford that has a by-pass filter system for their diesels. It was a really small micron, like 2-4.
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Old 12-08-2015, 10:46 PM   #31
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I had to get that model number pure one for the wrx because I ran out of RX8 filters. Got to make another order with mazda to get a case of those RX8 filters since they're great on all my cars.
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Old 12-09-2015, 04:25 PM   #32
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Do not use a diesel fuel filter for oil. It will destroy your engine.
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Old 12-09-2015, 04:31 PM   #33
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Do not use a diesel fuel filter for oil. It will destroy your engine.
Pretty much.


You know how sometimes you get an idea, and wonder "why, in the hundred-year history of this technology existing, with billions of dollars being spent in R&D at facilities all over the world, has nobody ever thought to do this obvious and brilliant thing?!"

Usually, it's because it's a really terrible idea.
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Old 12-09-2015, 04:48 PM   #34
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Diesel filters clog and are replaced regularly in my business. The symptom is low machine power due to running lean. There is no bypass. What happens when your oil flow becomes similarly restricted? The engine doesn't slow down, but the oil does.

Additionally, diesel fuel filter media is often designed to absorb any water present and to swell as it does. This swelling also reduces flow (design feature) to let you know you have a fuel problem that should be attended to. Try that with your oil supply and report back to us.
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Old 12-09-2015, 07:30 PM   #35
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For the record I was never intending to use a fuel filter for my oil. I was curious if 2manyhobyz ((or anyone else) had any luck good or bad with the 551318. *EDIT I guess I did say I'd like to try the larger filter. I should have said A larger filter before digging into that 551318 filter specs as a sidenote*

Quote:
Originally Posted by 2manyhobyz View Post
Eunn, will 7/8-14 still spin on the 20x1.5mm that we normally use? To the filters credit it does flow 12 gpm. I think it was Ford that has a by-pass filter system for their diesels. It was a really small micron, like 2-4.
I couldn't tell you. I would assume so since you have a picture of the filter I had posted installed? I was under the impression you had run that filter. EDIT I realize that a P551318 and napa 551318 (now 1318) are two very different filters.

Last edited by Eunn; 12-09-2015 at 07:48 PM.
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Old 12-09-2015, 07:34 PM   #36
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Diesel filters clog and are replaced regularly in my business. The symptom is low machine power due to running lean. There is no bypass. What happens when your oil flow becomes similarly restricted? The engine doesn't slow down, but the oil does.

Additionally, diesel fuel filter media is often designed to absorb any water present and to swell as it does. This swelling also reduces flow (design feature) to let you know you have a fuel problem that should be attended to. Try that with your oil supply and report back to us.
Diesels run lean all the time. It's called part throttle and idle. Also how often is this happening? I used to manage a fleet that had 30+ diesel engines trucks and highly abused off road equipment and I never had a performance problem unless a filter was neglected or bad fuel was pumped into the tank.

Last edited by Eunn; 12-09-2015 at 08:04 PM.
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Old 12-09-2015, 09:43 PM   #37
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Quote:
Originally Posted by Eunn View Post
Diesels run lean all the time. It's called part throttle and idle. Also how often is this happening? I used to manage a fleet that had 30+ diesel engines trucks and highly abused off road equipment and I never had a performance problem unless a filter was neglected or bad fuel was pumped into the tank.
You do realize that there's a difference in viscosity between diesel #2 and 5w30, right?


By all means, do the test and report back on the results. I'm genuinely curious to know whether my intuitive perception has any grounding in reality on this one.
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Old 12-09-2015, 09:52 PM   #38
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You do realize that there's a difference in viscosity between diesel #2 and 5w30, right?


By all means, do the test and report back on the results. I'm genuinely curious to know whether my intuitive perception has any grounding in reality on this one.

Yes. You do realize I've admitted to making a mistake which you will see if you read post #35.
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Old 12-09-2015, 10:25 PM   #39
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Yes. You do realize I've admitted to making a mistake which you will see if you read post #35.
Your Ninja-editing skills serve you well. But may the fleas of a thousand camels infest your armpits.
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Old 12-09-2015, 10:29 PM   #40
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Your Ninja-editing skills serve you well. But may the fleas of a thousand camels infest your armpits.
Check the times when edited and when you posted.
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