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Yes, but keep in mind that 5w30 thins out at higher temperatures vs. 10w30. i.e. 5w30 is better for cooler climates than 10w30 respectively. Theoretically you could see a mpg increase with the thinner oil comparatively, just don't sacrifice proper lubrication to save a few bucks.

In my '95 2.5l it never lost any oil when I ran 10w30. When I tried 5w30 it did go through some. I have a 99k engine. the oil wasn't being burnt, so I wasn't losing it quickly, I just needed to top it off after a few months. I probably had to add 1/2 quart.

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16y ago
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Q: Can you use 5w30 oil in a jeep 2.5l instead of 10 w30?
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