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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