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  #13  
Old 03-20-2013, 07:37 AM
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Re: Mopar Axle / Diff Oil

The Redline 75W85 is also fully synthetic, also comes with additives and there is also a 75W85 in the Mopar range as well.

Not sure whether it makes a difference, possibly a little in economy but I don't know how that could be measured.

I'm comfortable with the 75W-85 as that is what is in the Latest 2012 manual and also in Jeeps 2012 fluid specs.

Like I said, I don't think it makes a massive amount of difference.
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Old 03-20-2013, 04:45 PM
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Re: Mopar Axle / Diff Oil

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Originally Posted by Swampy View Post
The Redline 75W85 is also fully synthetic, also comes with additives and there is also a 75W85 in the Mopar range as well.

Not sure whether it makes a difference, possibly a little in economy but I don't know how that could be measured.

I'm comfortable with the 75W-85 as that is what is in the Latest 2012 manual and also in Jeeps 2012 fluid specs.

Like I said, I don't think it makes a massive amount of difference.
Yes you are right, it is though a lesson in the many products available and the marketing of them, it also gets down to opions and individuals at the various dealerships around the world, it shows no matter the expertise we will on accations have differences, probably a indicator of the times we live in.
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Old 03-20-2013, 05:46 PM
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Re: Mopar Axle / Diff Oil

This is my opinion based on only what has been said before in this thread. The 75W-85 oil would seem the most appropriate oil for the Jeep in its normal configuration as an SUV. This should give the best ballance of lubricity and fuel economy. However, if used in extreme conditions such as high temperatures, heavy towing or sustained high speed, then 75W-140 might be appropriate. It would be good if Jeep gave us a little more guidance on this. OK, it's hardly a deal breaker but still...
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Old 03-20-2013, 06:31 PM
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Unfortunately at some dealers, they simply do not stock all the required oil types and specs for all the various models. So whatever they have in that "big drum out the back" is what you get.

Yes it's a shame that we can't just check with Jeep Aust tech department. I tried that when I noticed that the engine oil quantity in the manual was wrong. They come back and said that 9.6 litres as stated in the manual is correct when it has been proven wrong, so zero confidence on those guys.
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Old 03-21-2013, 05:47 PM
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Re: Mopar Axle / Diff Oil

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Originally Posted by Swampy View Post
Unfortunately at some dealers, they simply do not stock all the required oil types and specs for all the various models. So whatever they have in that "big drum out the back" is what you get.

Yes it's a shame that we can't just check with Jeep Aust tech department. I tried that when I noticed that the engine oil quantity in the manual was wrong. They come back and said that 9.6 litres as stated in the manual is correct when it has been proven wrong, so zero confidence on those guys.
Fancy me defending Chrysler but in this case they are probably right. The 9.6L would be for a dry engine. That is, if you totally rebuilt your engine then added oil. There are so many places where oil gets hung up. It clings to all surfaces as it is designed to do, it pools on horizontal surfaces particularly the very bottom of the sump which never really drains properly. Then there is the oil filter, oil pump, oil cooler and oil ducts of which there are many. It doesn't help when the mechanic leaves your car for a while to cool so he doesn't burn is fingers on the sump plug. By that time time the oil has cooled and thickened. Then how long does he leave it to drain? Not long I expect. It is quite normal for oil change qualities to be quite a bit less that the engines oil capacity.
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  #18  
Old 03-21-2013, 06:03 PM
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Re: Mopar Axle / Diff Oil

Hi Bob,
I doubt there would be 1.2lt of oil left in the motor after a filter & oil change change.
At most I would think maybe 200ml, as there are a few low spots in the heads and such that could hold a small amount, but 1200ml is a lot of oil.
I would think there is a typo and it should be 8.6l not 9.6l.
Having done 3 oil & filter changes, I cannot see where the extra oil is hiding.
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  #19  
Old 03-21-2013, 06:19 PM
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I suspect that the 9.6 was a carry over from the previous manual and Merc engine...
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