The Donaldson/Houde centrifugal oil bath filter was original on the truck and I've modified the air cleaner in the truck to look like it might have been the original - but real Jeep connoisseurs will see the L/F head adaptation. But - never say "Willys didn't...".
Anyway - opinions are like armpits, I have couple and sometimes they stink . Here's one.
If you're going out and play in the sand, dust and dirt big time, there are a lot of folks who have evidence that the oil bath cleaners do a better job in getting the grit and crud out of air - especially when they have loaded up a bit. (see GmWillys comment about Caterpillar diesels from Iraq/Afghanistan and 5000 hour overhauls!)
If you're just playing in the dirt a little, I doubt if you would see any reason to change from the factory filter - just keep it clean (keep the oil bath clean too!). Just puttering around town - leave it as-is.
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