post #1 of Old 01-21-2010, 04:16 PM Thread Starter
laybackman
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Bigger oil filter for the 4.0

If this has been posted before I didn't see it but here goes.

My son and I decided to change oil in our two cars. I have the '95 YJ 4.0 and he just bought a ’93 Mustang 5.0. So off we got to the NAPA store to buy our oil and filters. The NAPA dude drops the two filters on the counter and I notice that they look like they are the same diameter. So we open up the two filters and I’ll be damned if they are identical except the Mustang oil filter is almost 1 ˝” taller. The Jeep filter number is a NAPA Pro Select 21085. The Mustang oil filter number is a NAPA Pro Select 21515.

So he pulls the specs for us and they have the identical mating faces so I decide to go with the Mustang filter for my 4.0. It fits just fine and here is where my intuition paid off, I think.

If my calkelashuns are right, the volume of the Jeep filter is 38.9272”. The Mustang filter has 54.4771” of volume. That’s 15.5499” more volume than the Jeep filter. I just added a bit more oil to the base for the additional volume of oil filter.

I figure that more filter material can't be bad now, can it.


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post #2 of Old 01-21-2010, 04:33 PM
Fhajad
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Max shows that he used a bigger one in his write up.

I don't quite see the purpose but I might do it if the price isn't too much higher.
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post #3 of Old 01-21-2010, 04:34 PM
jbolty
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Good info, but there is more to a filter than fitting. I looked up the specs on wix filters out of curiosity. Similar but the specs are a little different. Close enough for me though.

mustang
Quote:
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper/Glass
Height: 5.178
Outer Diameter: 3.660
Thread Size: 3/4-16
By-Pass Valve Setting-PSI: 8-11
Anti-Drain Back Valve: Yes
Ends: Metal
Beta Ratio: 2/20=13/23
Burst Pressure-PSI: 290
Max Flow Rate: 7-9 GPM
Nominal Micron Rating: 21
Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.834 2.462 0.200


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Quote:
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 3.790
Outer Diameter Top: 3.660
Outer Diameter Bottom: Closed
Thread Size: 3/4-16
By-Pass Valve Setting-PSI: 8-11
Anti-Drain Back Valve: Yes
Beta Ratio: 2/20=15/28
Burst Pressure-PSI: 290
Max Flow Rate: 7-9 GPM
Nominal Micron Rating: 21

Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.834 2.462 0.200

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Last edited by jbolty; 01-21-2010 at 04:52 PM.
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post #4 of Old 01-21-2010, 05:06 PM
Mean Max
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Quote:
Originally Posted by Fhajad View Post
Max shows that he used a bigger one in his write up.

I don't quite see the purpose but I might do it if the price isn't too much higher.
They're actually cheaper than the Mopar MO 090 that is called out.
Yep, I use the Motorcraft brand FL-1A filters from Wal-Mart.

Details here.

http://www.jeepforum.com/forum/f12/b...change-865490/

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post #5 of Old 01-21-2010, 07:48 PM
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post #6 of Old 01-21-2010, 08:09 PM
bob082484
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Ive been runnnin the bigger filters for years now. Ive found out that the 93 mustang with the 5.0 (It'll probably work with any 5.0) filter will work on the 4.0 and the 2.5. There is a writeup somewhere on retrofitting oil filters. Purolator Pure One #30001 and the fram tough gaurd #tg8 or any fram size 8 will work.
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