Larger oil filter for 4.0? - JeepForum.com

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post #1 of 20 Old 10-14-2011, 08:14 AM Thread Starter
Mariner2010
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Larger oil filter for 4.0?

Hey guys,
Just wondering if anyone knows of a larger filter from another vehicle/manufacturer fits onto a stock 4.0L. I have heard about some ford oil filters fitting, but I could not pin down a model. I know that you can cross manufacturers and often get a much better/larger filter for the same or often less money. My girlfriend has a TDI and I use a Caterpillar filter that is about 3 times as large as the stock filter from VW. Thanks for the help!

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post #2 of 20 Old 10-14-2011, 08:26 AM
dionysius
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Yes, it's an oil filter off a 5.0 Ford Mustang. I use the Mobil-1 filter M1-301. Holds an additional 1/2 quart oil.

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post #3 of 20 Old 10-14-2011, 08:46 AM
unlimitedlj
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yea you can run a larger filter but, its not going to buy you any additional protection. I would just use a regular Purolater or Wix. Its a common misconception that larger is better and thats not always the case. Its no different than the people who think 20w-50 is still the **** when yet a engine set up for a lighter oil will work just as good.
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post #4 of 20 Old 10-14-2011, 10:13 AM
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post #5 of 20 Old 10-14-2011, 10:49 AM
chris142
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Wix 51515, Napa1515,21515, Motorcraft FL1A, Purolater 30001 and the Orange can of Doom the Fram PH8A all have the same valving, gasket diameter etc as the stock Jeep filter does.
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post #6 of 20 Old 10-14-2011, 07:35 PM
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Quote:
Originally Posted by unlimitedlj View Post
yea you can run a larger filter but, its not going to buy you any additional protection. Its a common misconception that larger is better and thats not always the case.
There's also no harm in running the larger filter (since it's an exact fit) and having additional filter media surface area to provide an extra margin of protection (should you stretch an oil chage interval a bit) is certainly not a bad thing. More filtration is NEVER a bad thing unless it creates a pressure drop, which is not a concern here. I used to run a remote-mount 2 quart motorhome filter on a car I used to own that had a tendency to foam the oil (small sump). The extra total oil system capacity added by the motorhome filter effectively solved the problem I was having.

I run the FL-1A equivalent from one of 3 manufacturers (In order of preference: Baldwin, Wix and Purolator Pure-One) and am quite happy with the results.

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post #7 of 20 Old 10-14-2011, 07:46 PM
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be careful switching oil filters with high volume ones, after you run the engine and the fluid level goes back down make sure its filled properly, the larger filter will of course hold more oil. Diff ones also can have diff flow rates (single-double filtration layers) and diff fillter material. If you change to a double you could be putting stress on an already prone to fail 4.0 oil pump. Its a great engine, but the oil pump is sorta lacking already and double later can slow down flow to the heads. soo, causeing faster engine wear on the valvetrain. so , yes can cause harm, with absolutely no up sides. stay with stock. ~your local mechanic...... and if i remember correctly, the threads are the same as a common ford filter, but the gaskey on the reciever flange will barely make a seal leaving a potential for a leak. go with factory intented high capacity oil filters if you want a larger one, i believe wix makes ones for this purpose.
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post #8 of 20 Old 10-14-2011, 10:24 PM
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Originally Posted by ArmyMud View Post
be careful switching oil filters with high volume ones, after you run the engine and the fluid level goes back down make sure its filled properly, the larger filter will of course hold more oil. Diff ones also can have diff flow rates (single-double filtration layers) and diff fillter material. If you change to a double you could be putting stress on an already prone to fail 4.0 oil pump. Its a great engine, but the oil pump is sorta lacking already and double later can slow down flow to the heads. soo, causeing faster engine wear on the valvetrain. so , yes can cause harm, with absolutely no up sides. stay with stock. ~your local mechanic...... and if i remember correctly, the threads are the same as a common ford filter, but the gaskey on the reciever flange will barely make a seal leaving a potential for a leak. go with factory intented high capacity oil filters if you want a larger one, i believe wix makes ones for this purpose.
The short filter specified for the 4.0L and the longer FL-1A equivalent from your brand of choice have the exact same gasket diameter, 3/4"-16 thread pattern, bypass valve rating, micron rating, etc....in other words, the only difference is the length of the outer can and the filter media inside of it. As further proof, Ford used to specify the FL-1A and the FL-300 (the half-height version of the FL-1A and probably the closest equivalent for the 4.0L filter from the Motorcraft line) as alternates for one another on several applications, so that must mean it performs the same in terms of flow/restriction/etc. I've been running FL-1A equivalents on my Jeeps for 6 years now with no leaks or other issues.

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post #9 of 20 Old 10-14-2011, 10:47 PM
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I run a Purolator 30001, and have for years. I used to cut my old filters open, but haven't in a long time. The difference between the short and long filter is only the filter media. Everything else is the same. If you understand how a filter works, there is a bypass valve in every filter. If it didn't have a bypass valve, than you would risk an oil filter explosion. This used to happen in the past until they invented the valve. So essentially what you are doing by using the longer filter is DOUBLING the available filter media, which would make the filter less-likely to send oil down the bypass. There is no easy way to know if your oil is going through the media or bypass. In this way, I believe the longer filter is better.
Another advantage, tho neglagible, is a slight cooler-effect of the filter itself. I don't know that it matters at all, but it's worth a mention.

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post #10 of 20 Old 10-15-2011, 08:22 AM
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I run the Motorcraft FL-1A over the stock filter simply because it costs less at WallyWorld! The gasket is the exact same diameter as the Mopar it replaced. It never leaks, and because the can is longer, it's easier to remove it.

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post #11 of 20 Old 10-15-2011, 09:53 AM
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Personally, I believe that if the oil and filter are both changed at the proper intervals, there is no significant benefit to running a larger oil filter. One, the very slight amount of extra oil is not significant where cooling is concerned. But on the larger surface area of a larger filter, that just allows it to filter longer before it starts clogging... the larger surface area doesn't actually filter any better... just longer before it can clog up. So if you aren't looking for a longer change interval, I personally don't see any benefit to a larger oil filter. Not to mention you have to buy a 7th quart of oil and use just a very small percentage of it to have the same oil leve.

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post #12 of 20 Old 10-15-2011, 10:05 AM
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Makes sense Jerry, but on mine using the larger filter it still holds right at 6 quarts.
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post #13 of 20 Old 10-15-2011, 10:38 AM
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.. but on mine using the larger filter it still holds right at 6 quarts.
I agree, there's not enough extra volume held in most slightly larger oil filters to make a noticeable difference. I only mentioned the extra oil needed if it was a significantly larger oil filter.

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post #14 of 20 Old 10-15-2011, 10:56 AM
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Originally Posted by Jerry Bransford View Post
I agree, there's not enough extra volume held in most slightly larger oil filters to make a noticeable difference. I only mentioned the extra oil needed if it was a significantly larger oil filter.
There is a larger filter than the PH8A/FL1A series filter than fits on the 4.0? That was the one I was referring to.
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post #15 of 20 Old 10-15-2011, 09:44 PM
chris142
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There is a larger filter than the PH8A/FL1A series filter than fits on the 4.0? That was the one I was referring to.
Fram # PH966 and Wix 51773. You don't want that filter. It's only good to 30 microns where the PH16 and PH8A sized filters are good to 20 microns.
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