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  #37  
Old 02-27-2011, 08:36 AM
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Re: 5w25

Quote:
Originally Posted by Breitling65 View Post
Explanation is very simple - that is oil they probably got only in stock :-)
Yep, I'll be buying and bringing my own Mobil One 5w-20 to the dealer to use when the time comes!
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  #38  
Old 02-28-2011, 11:59 AM
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Re: 5w25

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Originally Posted by OneCent View Post
I don't agree here - 5W30 passes all tests for 5W20.
Are you a chemical engineer? specializing in lubricants?

How come you are not working for chrysler?

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  #39  
Old 02-28-2011, 01:58 PM
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Re: 5w25

Quote:
Originally Posted by OneCent View Post
I don't agree here - 5W30 passes all tests for 5W20.
Perhaps it's the language barrier but the tests are quite clear, 5W-20 and 5W-30 only intersect at one point in the testing, Low-Shear-Rate
Kinematic Viscosity(cSt) at 100C (Min and Max) .

20 weight = cSt 5.6 (Min) - cSt 9.6 (Max)
30 weight = cSt 9.6 (Min) = cSt 12.5 (Max)

THEY ARE NOT INTERCHANGEABLE

http://widman.biz/English/Tables/J300.html
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  #40  
Old 02-28-2011, 04:25 PM
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Re: 5w25

Quote:
Originally Posted by mjw930 View Post
Perhaps it's the language barrier but the tests are quite clear, 5W-20 and 5W-30 only intersect at one point in the testing, Low-Shear-Rate
Kinematic Viscosity(cSt) at 100C (Min and Max) .

20 weight = cSt 5.6 (Min) - cSt 9.6 (Max)
30 weight = cSt 9.6 (Min) = cSt 12.5 (Max)

THEY ARE NOT INTERCHANGEABLE

http://widman.biz/English/Tables/J300.html
I'm sure the language barrier is a problem here. The Webpage is nice, but do not say anything about if you or i am wrong.
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  #41  
Old 02-28-2011, 05:45 PM
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Re: 5w25

They used the WRONG oil for the same reason my dealer did, they have it in bulk and its easy!

Do as I did, request they change it to the CORRECT grade listed by Jeep, yes, 5W-20, at their cost for labour, and pay any difference in the oil value.

My dealer had no issues with complying, and the MDS definately works smoother.

My Jeep operates in similar ambient temperatures to yours mate
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  #42  
Old 02-28-2011, 05:50 PM
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Re: 5w25

FYI, from what I've read on bobistheoilguy forums, MDS in the 5.7 Hemi operates more smoothly using synthetic 5W-20.
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  #43  
Old 03-02-2011, 02:05 PM
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Re: 5w25

Mobil recommends a variety of Mobil 1 oils with the following viscosities for the Overland Pentastar, assuming it has around 10k miles and is used above 0F degrees:
0W30 or 5W30

For the Hemi:
0W20, 5W20

http://www.mobiloil.com/USA-English/.../Homepage.aspx
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  #44  
Old 03-02-2011, 03:19 PM
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Re: 5w25

First mod for me, Mobil 1 5w20 synthetic oil..
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  #45  
Old 03-02-2011, 06:10 PM
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Re: 5w25

Mobil 1 EP is probably the best stuff available, if you can put up with the nearly $9/qt price!
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  #46  
Old 04-04-2011, 08:29 AM
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Re: 5w25

Hi Guys, I was told by a friend who is a sales rep for an oil company that suplies Jeep here in Melbourne that they always put 5w40 into the Hemi's. They buy it in bulk drums and it is just more convenient for them rather than having to carry all the different grades of oil. All I can say is I had my oil replaced with 5w40 and it doesn't run smooth under 1500-2000 RPM. In my handbook it states that the required oil is 5w20, however 5w30 may be used if 5w20 is not available (I actually have trouble finding 5w20 in auto shops). I also believe that the 6.1 liter SRT8 engine calls for 5w40.

With regard to the Service interval, my manual states 12 000 KM unless used in extreme or dusty conditions, which may explain the dealers recommendation for 10 000 KM (or maybe if on average customers come back sooner they can make more $$$).

Cheers,
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  #47  
Old 04-04-2011, 01:32 PM
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Re: 5w25

Quote:
I also believe that the 6.1 liter SRT8 engine calls for 5w40.
The 6.1 liter SRT8 engine doesn't have MDS. It is the MDS in the 5.7L Hemi that requires the 5W20 for optimal functionality.
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  #48  
Old 04-05-2011, 02:46 AM
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Re: 5w25

BTW, I complained to Chrysler about the oil issue and told them that I was invoiced for 5W40 and Jeep service said that was all they used.
Chrysler's answer was that the invoice must be wrong. I told them that the service center confirmed they used 5W40, but they insisted that was not possible as it is clearly stated to use 5W20, so the invoice must be wrong...
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