To change the oil in a 2004 Jeep Cherokee, warm the engine, remove the oil cap, and place an approved receptacle beneath the oil pan to drain the oil into it. Remove the oil pan bolt with a wrench, and allow the oil to drain completely. Remove the oil filter, and replace it with a new filter. Replace the oil pan bolt, pour the recommended amount of new oil in the engine, and replace the oil cap.
To warm the engine, start the car, allow it to remain running for approximately 10 minutes, and turn the engine off before removing the oil cap. Remove the oil filter using an oil-filter wrench, and use a standard 5/8-inch wrench to remove the oil pan bolt. Before setting the new oil filter in place, spread a small amount of used oil onto the gasket and threads of the new oil filter.
Most Jeep Cherokees require 6 quarts of 10-W 30 motor oil to operate properly. Refer to the owner's manual to determine the exact type and quantity of oil to put into the vehicle. Allow the oil to settle for several minutes, and check the oil level in the vehicle. The oil should measure between the low and full marks on the dipstick when properly filled.