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4.2 quarts
4.2 u.s. quarts (4.0 liters / 3.5 imp. quarts)
4.2 w/ filter
4.2 US quarts for the four cylinder, 6 for the six cylinder. This information is in your owner's manual. If you don't have one you can get a free download from Subaru, where I looked for this information. http://www.subaru.com/owners/resource-center/owners-manuals/search.html
The owners manual states 4.2 quarts. I use 4.5 to keep things easy.
5 quarts dry engine - 4.5 quarts for an oil change.
You did not specify which engine you have. The 4 cylinder takes 4.2 quarts but your owner's manual will give you that information. There is a lot of important information in that manual and you should familiarize yourself with it.
5 quarts if you change the filter.
12 quarts are needed
Six quarts of oil are needed to change the oil on a 1992 Jeep Wrangler.
6 quarts with filter change
There are approximately 6 quarts of oil needed for an oil change for a 2002 Jeep Wrangler.