Never needed to throw the additive in the AAM in my 04.5, IIRC it said in the owner's and service manuals additive not needed.

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.

 

do you think 75/140 is to thick?

 

It will cause no harm. It's just more than what's needed. If u put a good 75/90 in you'll have no problems. I use 110. Just didn't want to go to the 140 in case it dropped my
Mileage at all. Any will work.

 

Your axle will be fine with a 75w140, I ran that in my dodge when I had it. Didn't notice any drop in mpg. I am not amsoil's biggest fan but I will say their gear oil is second to none IMHO. between them and redline you can't go wrong.

 

do you think a thicker gear oil will cuase more harm then good? Should i go 110 not 140, or does it really matter?

 

Didn't do any harm when I ran it in mine.

 

im going with 75/90 in mine (amsoil) but i use it for mostly a daily driver and when i haul its not very often, now if you haul alot but not very heavy loads i would go with 75/110 and if you haul heavy loads alot i would go with 75/140

 

You can run them all no problem. Flip a coin
I went middle of the road with the 110.

 

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.

 

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.