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Depends on the year. Older Jeep 4.0 In-line 6 cylinders used 10w30. Newer models require the use of 5w30. Your owner's manual will list the correct weight. Of course if you do not live in a cold climate you can use 10w30 year round.

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16y ago
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Q: What weight oil should be used on 4.0 jeep motor?
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