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how much oil does the rear hold?

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Old 02-02-2009, 06:19 PM
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Default how much oil does the rear hold?
and which kind does everyone recommend using? is that GM additive required?
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Old 02-02-2009, 06:25 PM
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2 quarts

torsen = synthetic or mineral oil no additive needed

auburn = mineral oil with the additive
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Old 02-02-2009, 06:30 PM
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how can i tell which posi i have?
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Old 02-02-2009, 07:34 PM
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I thought only 98s had the Auburn?

Look at your differential, if it has gears it is a Torsen...Springs it is an Auburn.
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Old 02-02-2009, 08:33 PM
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i haven't torn it apart yet.. i didn't know if there was a vin number code that would tell you or something
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Old 02-02-2009, 08:37 PM
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Here is the link I was looking for...my post on #4 was correct...

https://ls1tech.com/forums/1740885-post7.html
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Old 02-02-2009, 08:45 PM
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oh okay thanks! so just synthetic 85w140 will be fine or 75w90
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Old 02-02-2009, 08:47 PM
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Just use regular oil plus additive. No synthetic.
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Old 02-02-2009, 08:50 PM
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well unfortunately the guy that previously had my car changed all the fluids to synthetic. so do you think anything is messed up because of that?
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