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Old 04-30-2010, 03:28 PM   #1
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2009 jk what oil can I use?

I'm a American living in the UAE I can not find 5w/20 where I'm at and the only oil I can find is a fully Syethetic 5w/40. it's rating are API SM/CF, Acea A3/B4/04 and MB 229.3 . Is this oil ok to use keep in mind it's 90 degrees at night and 120 during the day here. Jeep wrangler 3.8l

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Old 04-30-2010, 04:09 PM   #2
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I'm a American living in the UAE I can not find 5w/20 where I'm at and the only oil I can find is a fully Syethetic 5w/40. it's rating are API SM/CF, Acea A3/B4/04 and MB 229.3 . Is this oil ok to use keep in mind it's 90 degrees at night and 120 during the day here. Jeep wrangler 3.8l
I don't know what any of that means, but if no one can give you an answer, I'll call my dealer Monday and ask them.

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Old 04-30-2010, 04:15 PM   #3
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Old 05-01-2010, 01:51 AM   #4
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The standard oil is a bit thinner than the oil you are considering. What that means is that if it's hotter then thicker oil is ok. If it's thick and freezing outside it can actually freeze the oil in your car when it's off.

I'd go 10w30 if you can. If not you should be fine with the 5w40
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Old 05-01-2010, 09:48 AM   #5
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Old 05-01-2010, 02:47 PM   #6
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If all else fails I would use plain ol' 10w30 over 5w40.
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Old 05-01-2010, 09:12 PM   #7
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In those temps I would go with the synth 5w-40!! don't see a problem.
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Old 05-02-2010, 12:45 AM   #8
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your in a blistering hot desert. i don't see any issues either using thick oil like that. 1 thing i would consider doing however is getting an oil pressure gage and watching things for a bit. i've never torn down the 3.8 so i'm unsure how adequete it's lubrication system is...but i'd be willing to bet that i'd be alright.
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Old 05-02-2010, 10:08 PM   #9
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Don't do it!!!!!!!! when the engine warms up its going to operate close to the the same temp no matter what the outside remperature is. The engine was designed to operate with 20 weight, 40 weight may be too thick to lubriacate the close tolerance parts of your engine. at least try to find 30 weight.

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