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Old May 8th, 2007, 16:10
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2001XJ 2001XJ is offline
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Brand of gear oil recommendations?

I searched and only came up with 1 thread that didn't really have any brands per se more of what grade was required like GL-5 80/90.

I am getting new gears installed and was wondering if you guys had any suggestions as to one brand over another. I have been looking at Lucas Heavy Duty differential 80/90 oil to put in. Also, I know I need to add a friction modifier, is this the same as Lucas' oil stabilizer or is there a certain brand? Want to make sure I am putting in some good protection for my gears

thanks

Last edited by 2001XJ; May 8th, 2007 at 16:20.
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Old May 8th, 2007, 16:25
BlackJax BlackJax is offline
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Re: Brand of gear oil recommendations?

I run Redline Synthetic Heavy Shockproof. It works great for offroading where shockloads are more prevelant. I have lockers front and rear though, so YMMV. I don't run friction modifier cause there are no clutch packs.
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Old May 8th, 2007, 16:46
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JNickel101 JNickel101 is offline
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Re: Brand of gear oil recommendations?

Royal Purple...it has a limited slip/friction modifier additive already in it...IIRC
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Old May 8th, 2007, 17:17
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Racer-X Racer-X is offline
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Re: Brand of gear oil recommendations?

I ran cheap conventional for the first 1000 miles after I installed my true tracs and 4.56's and then switched to synthetic after the gears were broke in. I use Amsoil, Red Line, or Mobil 1 fluids throughout my vehicles myself but there are plenty of good synthetics on the market. Most synthetics do not require the addition of a friction modifier IIRC.
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Old May 8th, 2007, 17:19
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Tim_MN Tim_MN is offline
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Re: Brand of gear oil recommendations?

Use any brand name. I use Mobile1.

Regular 85-90 oil if you do lots of water crossings or mud runs because you should be changing gear oil often.

Synthetic 75-90 for a DD or 75-140 if you tow a lot. Friction modifier is only necessary if you have a limited slip with clutch disks like a factory Trac-Loc.
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  #6  
Old May 8th, 2007, 17:49
fuzzydog fuzzydog is offline
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Re: Brand of gear oil recommendations?

I just installed an 8.8 in my Xj and my research led me to royal purple 75w140. you read the snake oil stuff, and the proprietary stuff and you have to make up your own mind what makes sense.
Also I switched my audi tranny fluid (5 spd) from dino to amsoil and that made quite a difference in smoothness and noise reduction.
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Old May 8th, 2007, 17:58
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Re: Brand of gear oil recommendations?

If amsoil makes it thats a very good oil.
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Old May 8th, 2007, 18:03
fuzzydog fuzzydog is offline
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Re: Brand of gear oil recommendations?

sorry, didn't mean to imply that amsoil makes royal purple - although they might. I was just saying that i would go with either one
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