* Check your owner's manual: The most accurate information will be found in your owner's manual. It will specify the recommended oil weight (e.g., 5W-30, 10W-30) based on your engine and your climate.
* General Guidance (if you don't have the manual): In most cases, 5W-30 is a good starting point for a 2004 Jeep Wrangler Sport, particularly in moderate climates. For extremely hot climates, 10W-30 might be suitable, while in very cold climates, 0W-30 might be better. However, again, always defer to your owner's manual.
Using the incorrect weight oil can negatively affect engine performance and longevity. Don't rely solely on online advice; consult your owner's manual for the definitive answer.
