Rear differential fluid
#11
Who knows, I would just empty it, fill it with fluid...drive around a bit and if it needs it then put it in. But the factory says you don't need it...that being said the factory thought 10 micron fuel filters on a 26k+ psi fuel system was a good idea.
#13
#14
#17
#19
Its needed with some fluids...if it chatters, add LSD additive.
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I ran a single fill of Royal Purple 85w140 for well over 100k...it looked like new when I drained it and had zero metal on the magnets.
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Milky brown is likely water contamination as noted...it can also be aeration.
Last edited by steved; 07-02-2012 at 09:39 AM. Reason: Automerged Doublepost
#20
From what I've always heard, thicker gear oil within specs will provide you with better protection if you are towing heavy loads or offroading. Otherwise it will negatively impact your fuel economy. If you aren't towing or wheeling, I'd stick with the 75w-90 synthetic w/ limited slip additive.