Of course, synthetic oil is a better choice of oil in all vehicles.
10w30
A 2005 Jeep Wranger Rubicon with the 4.0 6 cyl engine requires 6 quarts of oil.
The 4.0 2003 Jeep Wrangler needs 6 quarts of oil for an oil change.
For the 4L engine its 6 quarts of 10w30.
10w30
10w30
10w30
10W30 for sure
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10w30
I believe the capacity is 6 quarts