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Old 01-27-2013, 10:09 PM   #1
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5w20 2013, verses 5w30 2012???

I'm sure that this has been discussed many times in the past. Has anybody looked into why the same engine, but different years, requires different viscosity oils.
I have heard some say, well that is what the factory recommends. That is fine, but there has to be a reason for it.............
Are the tolerances tighter on the 3.6 2013 engine?
Is it strictly fuel economy related?
Thinner oil does dissipated heat better so is it a heat related issue?
Has anybody talked with a factory rep to better understand as to why?

One of my concerns is in Phoenix mid summer we see temps radiating off of the asphalt at approx. 165 degrees. 20 weight is a very thin viscosity to lubricate the engine properly at high oil temperatures.

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Old 01-27-2013, 10:41 PM   #2
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I am also in hot Arizona and I run 10w30 in my 3.6 2012 model. 10w30 is a good multi viscosity oil and should be good for any engine including the 2013 3.6.

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Old 01-27-2013, 11:43 PM   #3
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they say it's to meet corp. fuel economy standards.
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Old 01-28-2013, 04:06 AM   #4
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Both Jeep dealerships in my area only use 10w30 period. When I asked them while getting my free oil changes they claim it protects the engine better and Jeep doesn't have a problem with it. And for synthetic they both use Mobil 1. I have seen on this forum many saying other wise.
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Old 01-28-2013, 10:58 AM   #5
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I asked my dealer this same question months ago. I received in reply mountains of technical articles on engine oil and viscosity. Bottom line I could not get the question answered.
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