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In the 2004 Jeep Wrangler, the 2.4-liter inline-4 engine requires 3.78 liters (4 quarts) of 5W-30 synthetic motor oil, while the 4.0-liter V6 needs 5.7 liters (6.0 quarts) of 10W-30 synthetic oil. The main distinction between these oils is that the 5W-30 flows slightly faster during cold starts compared to the 10W-30. However, both provide similar protection once the engine reaches operating temperature. Jeep recommends changing the oil every 5,000 miles or 6 months, especially considering the Wrangler's off-road capabilities. If you typically don't drive in dusty conditions, you might extend the intervals between oil changes. The average cost for an oil change for the Wrangler ranges from $140 to $160, inclusive of labor.
The 2004 Jeep Wrangler with the standard 2.4 L inline-4 engine requires 4 quarts of 5W30 oil, while the upgraded 4.0L inline-6 engine for this model year needs 6 quarts of 10W30 oil.