To perform an oil change on a Jeep Wrangler, you need 6 quarts of 5W20 oil, a new oil filter, a 13-millimeter socket wrench, a small oil filter wrench and a drain oil container. Use the 13-millimeter socket wrench to remove the oil pan drain plug, and allow the oil to drain into the container before replacing it and putting in new oil.
When changing oil, make sure the vehicle's engine is sufficiently warm for the oil to flow, but not hot enough to burn the skin if oil accidentally spills. Cold oil is viscous and does not drain easily, so the engine should be left to cool before attempting the procedure. Don't overtighten the drain plug when replacing it after draining the engine entirely of oil.
After replacing the drain plug, move the oil container beneath the passenger seat, and use the oil filter wrench to loosen the filter located there. Remove the old filter, and allow it to drain, replacing the filter once it has drained entirely and installing a new one in its place. At this point, verify the gasket to make sure that there is no chance of springing a oil leak once the filter is replaced.