I've been running a Wix filter since I bought my XJ back in March. Today I picked up a Mopar filter. They're were priced at Advanced Auto for $6.99.

After running the XJ, getting it up to operating temp, approximately 200*. I noticed there was a considerable increase in oil pressure. Approximately 5 - 8 PSI.

Normally when running a Wix, my hot idle temps average about 20 - 25 PSI. With the Mopar it's running right around 33. Under load, it's hitting around 58
PSI. When normally, with a Wix, it would average 40 - 50 PSI.

This leads me to believe, at least with my XJ, Mopar out performs Wix, at an expense of only $0.25 compared to a Wix.

Now I can't say I've noticed a gain in performance, due to it being newer oil. Of course it's running smoother. But nothing out of the ordinary. However an engine running tighter on 30 weight oil, and only due to a filter change, and $0.25... That has to account for something.

I just thought I'd share, and possibly get some feedback on my experience using a Mopar filter, opposed to others on the market.

Filter used: Mopar.
Oil Used: 6qts Rotella T (crude) 10w-30.
Mileage: 173,***.
Year: 1998 Jeep Cherokee.

 

I use Mopar filters, they're good filters. I do plan on changing to a WIX filter on my next oil change though.

 

FYI you can run a filter for a ford 5.0 which gets you more oil capacity, .5-1 qt. Purolator # P3001, Mobil # M301. This is a direct fit for 4.0's with a horizontal filter mount but can be upgraded on older models. Not sure of the years but my 99 is a direct swap.

 

The WIX/Napa Ford filter number is 1515 for the oversized filter.

I've run the oversized filter on my 92 MJ, 93 XJ, and 03 TJ.

 

Whats the benefit of running an oversized filter?

 

More oil, more filter material inside the filter so theoretically anyway better filtering.

 

I ask because A) never heard of this, and B) my oil pressure is around what the OP posted for his mopar filter, 30+ at idle, 40-50+ under load. When I first bought the Jeep it was about 10psi lower. I am using a filter from walmart, cant recall the brand name and cant check right now, but it is a major one with a not so great reputation. 10w-30 penzoil non-synthetic high mileage oil.

 

I run motorcraft filters they perform as good as mopar my oil psi stays around 55psi driving and 40psi idling

 

The oversized Bosch D+ is D3500.

 

OEM or purolator IMO is the best way to go

 

i run motorcraft FL1A

 

I stick to Mopar or Bosch in my XJ.

 

I run oem from china Toyota 22re filters....

 

I don't see the appeal of running a larger filter.

You're putting on a larger filter. A filter that's drawing in more oil, thus taking it from the engine. However your lubrication system need 6 quarts, so you add more oil. However it can only sustain a certain amount in the engine, before fouling your sparkplugs, or creating heavier leaks. At that point you're adding more, but just enough to keep it safe on the dipstick.

Now you have a larger filter, but it needs to cycle through more oil anyways just to keep it clean. At this point... You just have more oil to clean because it's all getting cycled through your engine, picking up gunk.

I don't know if my explanation is making sense so i'll try to break it down into ratios...

Let's say factory specs =

10/10 Oil/Filtration

Larger filter alone =

5/15 oil/filtration
Because the larger filter is carrying more oil, thus you're loosing what you need for lubrication.

More oil + Larger filter =

10/10
Now things are back in balance, you're just carrying more oil to accommodate a larger filter.

Now you have a larger filter... But it's cycling a greater volume of oil. Thus nothing changes. The only thing more oil is going to get you, is diluted dirt. Not as concentrated as it would be, therefore less mass, therefore more debris that will slip through your cellulose filtration.

I hope this makes sense to someone.

 

Your logic is kind of skewed. A larger oil filter has more filtering surface area and allows up to another half quart of oil to aid in lubricating and cooling the engine enternals. A half of quart of oil is not going to offer much of a gain, but it's not going to hurt anything either.