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gm additive

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Old Mar 29, 2005 | 11:55 PM
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Default gm additive
I have a 2002 Z28 and plan on changing diff. fluid this weekend. Do I need the gm additive or not???
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Old Mar 30, 2005 | 12:02 AM
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yes you will need a posi additive or it will grind. i just changed mine tonight. i used a additive made by transX, with mobil1 75w90. car is a lot smoother now.
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Old Mar 30, 2005 | 02:17 PM
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If you use a premium oil like Royal Purple, Redline, or even Lucas gear oil, you won't have to put in additive. They come with additive in it already.
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Old Mar 30, 2005 | 03:09 PM
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Originally Posted by FIREHAWK#608
If you use a premium oil like Royal Purple, Redline, or even Lucas gear oil, you won't have to put in additive. They come with additive in it already.

True.
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Old Apr 1, 2005 | 05:22 PM
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you don't need additive for the torsen lsd.
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Old Apr 1, 2005 | 05:27 PM
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Don't use synthetic!!!! You'll get the one wheel burnout
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Old Apr 1, 2005 | 07:05 PM
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Originally Posted by Dragula
Don't use synthetic!!!! You'll get the one wheel burnout
explain......i notice better traction since i changed to mobil1 syn, less with the old generic 80w90
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Old Apr 1, 2005 | 07:15 PM
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Posi & Synthetic don't mix...at least if you have an Eaton diff. The synthetic lubricates so well that the diff cluth plates slip.
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Old Apr 1, 2005 | 07:19 PM
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https://ls1tech.com/forums/showthrea...ynthetic+Eaton
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Old Apr 1, 2005 | 11:05 PM
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so your telling me to *NOT* use synthetic fluid in my 10bolt??? im pretty sure i have a torsen since i have a 2000
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Old Apr 1, 2005 | 11:36 PM
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i have lucas and GM posi additive in my differential.
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Old Apr 4, 2005 | 09:36 AM
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Torsens (99 and up) REQUIRE synthetic. Read your owner's manual. They usually add the additive to the Torsens too to prevent the "rusty screw" sound that sometimes happens.
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Old Apr 4, 2005 | 09:49 AM
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oops....i forgot to add the additve in my diff. change on mt lat oil cahnge....i used mobil 75 90....but i havent really noticed the difference.....but im gonna add it the next time...hell i just forgot
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Old Apr 4, 2005 | 10:47 AM
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Originally Posted by SStheBest
oops....i forgot to add the additve in my diff. change on mt lat oil cahnge....i used mobil 75 90....but i havent really noticed the difference.....but im gonna add it the next time...hell i just forgot
You don't need to add limited slip, Mobil oil has it already! Use the money to buy a 6-pack
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Old Apr 4, 2005 | 10:53 AM
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Just to confirm:

Torsen = Synthetic only, no additive.

Is this correct? I am changing the fluid in my torsen rear end too. I do not want to put anything unnessesary in there.
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Old Apr 4, 2005 | 11:12 AM
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Originally Posted by BADSZ28
Just to confirm:

Torsen = Synthetic only, no additive.

Is this correct? I am changing the fluid in my torsen rear end too. I do not want to put anything unnessesary in there.
Premium gear oil and no additive! Just buy some Lucas from the auto parts store. It will actually "walk" up the gear set as they are spinning, good protection. Forget the additive unless you are using bargain basement oil
Last edited by FIREHAWK#608; Apr 4, 2005 at 11:33 AM.
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Old Apr 4, 2005 | 11:28 AM
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Torsens require synthetic...it's in the manual!!!

BADSZ28...yes you are correct. Mobil synthetic is what the shop put in the mine, and the additive is optional.
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Old Apr 4, 2005 | 10:37 PM
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my bad
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Old Apr 6, 2005 | 04:31 PM
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What about on a 98 rear end 3.42? I bought 2 qts of Royal Purple. I thought was enough.

B
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Old Apr 6, 2005 | 08:31 PM
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im not exactly sure but i beleive the 98 cars had auburn difs. and that they dont require synthetic. some correct me if im wrong. and i dont think they will require the additive. i could be totally wrong... =P
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