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Old 04-19-2008
Blackhawk's Avatar
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Join Date: Jun 2007
Location: WI
Posts: 586
Question on gear oil

is the severe gear 75w90 oil from Amsoil interchangedable with the SAE80w90 that the manuel reccomends? keep in mind that i have a locker. i want different oil cuz the stuff i have in there now doesn't really keep the diff very cool.
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Old 04-19-2008
greygooseranger's Avatar
Join Date: Apr 2006
Location: SE Michigan
Posts: 3,293
Yes, you will be fine. I would however run the 75w-140 if you are going to be towing a lot...

I run 75w-140 in my jeep (front and rear axles) and it has made a noticeable difference. Both in temp, and in cold weather performance....
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Old 04-19-2008
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(gasp) i use lucas gear lube ONLY and also in 75w140.

lucas is the only product out there that "climbs" up the gears.
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Old 04-19-2008
rolsmojave3's Avatar
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Join Date: Jun 2006
Location: Wisconsin
Posts: 2,852
In my manual it says use 80w-90, the tag on the axle reads 75w-140. Pick your choices.
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Old 04-20-2008
Join Date: Oct 2006
Location: Eureka, Ca
Posts: 28
I noticed a little hit in MPG when I changed to the heavy stuff. I use
80-140 red line synthetic. It really quieted down the lockers though.
I was using 75-90 before.
I think any quality gear oil especially synthetic will help keep it cooler.
If you are really worried about it, you could get a new cover with either cooling fins or better yet increased fluid capacity.
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