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Old Jul 24, 2012 | 04:48 PM
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Differential Oil
What does everyone use, and what do you like about or notice about it. Also in the 2003, V10 X owners manual as to differential oil of course it says not to change unless leaking or submerged( I have no idea what the PO did did to the X) but I am going to change it anyway, the owners manual lists the captivity of the front but leaves oil type blank and then list the captivity for the rear and says to replace with 75/140W syn, I guess this is ment to imply that the same weight is used in both differentials. Of course the Haynes manual says to use 75/90W in the front but I think that the manual with the X would more than likely be the one to follow, Thoughts. A question about motor oil, is anybody using heavier motor oil weights with the heat this summer. Never had problems with 5/20W MC blend before but never had a V10, Thanks again
 
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Old Jul 24, 2012 | 04:56 PM
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75/140 in the rear, 75/90 in the front. I use Mobil 1.

If you have a limited slip rear, make sure to add the friction modifier as well.

Front capacity is 3.8 pint (2 qt)
 
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Old Jul 24, 2012 | 05:04 PM
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Wonder why my X owners manual didn't list the front differential oil weight as 75/90W, save on ink? Seems to make sense though as the front differential isn't used like the rear
 
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Old Jul 24, 2012 | 05:07 PM
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Mobil 1 was what i grabbed
 
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Old Jul 25, 2012 | 08:08 AM
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Surprised no one rang in with AMSOIL or Red Line or something else
 
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Old Jul 25, 2012 | 09:37 AM
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I have royal purple in my excursion and It comes with the friction modifier in it. It's also what the parts store closest to my house caries.
 
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Old Jul 25, 2012 | 11:17 AM
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Originally Posted by Treker58
Surprised no one rang in with AMSOIL or Red Line or something else
I use AMSOIL in mine.....
 
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Old Jul 25, 2012 | 01:54 PM
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Royal Purple in mine - working great so far!
 
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Old Jul 25, 2012 | 06:31 PM
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For future verification the weights required are printed on tags on each diff housing.
 
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Old Jul 27, 2012 | 05:40 AM
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Originally Posted by Monsta
For future verification the weights required are printed on tags on each diff housing.
No tag on my front differential on the X or the 2006 F350
 
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Old Jul 27, 2012 | 06:37 AM
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Mobil One is what I use also and it also has the friction modifier in it for LSD rearends.
 
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Old Jul 27, 2012 | 03:21 PM
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Originally Posted by Treker58
No tag on my front differential on the X or the 2006 F350
Hmmm...weird.
 
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Old Jul 28, 2012 | 07:06 AM
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There is a tag on the rear, guess whoever the front tag guy/girl working on the line had to used the pisser as mine went by
 
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Old Jul 28, 2012 | 10:27 AM
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Originally Posted by Treker58
There is a tag on the rear, guess whoever the front tag guy/girl working on the line had to used the pisser as mine went by
Or the cover has been removed at some point and the tag didn't get put back on.
 
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Old Jul 28, 2012 | 10:58 AM
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I put mobile 1 in as well when doing my cover. Has the modifier in it already.

 
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