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Old Apr 20, 2010 | 08:02 PM
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Default diff. fluid

OK going to change the diff. fluid and thought I would ask everyone seems to think works best. I have the GM diff. additive and was going to get some cast. diff. fluid but I thought I would ask what everyone else uses. Thanks Richard
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Old Apr 20, 2010 | 09:46 PM
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royal purpal love it no noise drive great in any condition
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Old Apr 20, 2010 | 10:36 PM
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Default Diff Fluid Change

Amsoil Severe Gear 75W-90
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Old Apr 20, 2010 | 11:43 PM
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Originally Posted by Navy Blue 210
Amsoil Severe Gear 75W-90


That's what I use as well. Use it in my Toyota as well and have put significantly more miles on that vehicle.
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Old Apr 21, 2010 | 06:30 AM
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This has been asked many times. Do a search, add up the responses and then you'll have you answer.
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Old Apr 21, 2010 | 08:11 AM
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Mobil 1 75w-90
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Old Apr 21, 2010 | 08:48 AM
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You can't go wrong with the GM synthetic diff fluid along with the GM limited slip additive. That's what I used. No diff noise whatsoever.
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Old Apr 21, 2010 | 10:51 AM
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Make sure the fill plug will back out before you drain the differential, though. Don't want to drain it and have no way of re-filling it.
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Old Apr 21, 2010 | 11:24 AM
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Originally Posted by Edmond
Make sure the fill plug will back out before you drain the differential, though. Don't want to drain it and have no way of re-filling it.
And make sure to find the metal gasket for the drain plug and reinstall before filling the diff.
Ask me how I know!
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Old Apr 21, 2010 | 09:20 PM
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Thanks for the advice everyone
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Old Apr 21, 2010 | 09:33 PM
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I use and recommend this:
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)

Note that this fluid comes with friction modifier already in it and for the C5, adding additional modifier is not normally needed to prevent diff chatter. I use this without modifier in my 02 Z06 on the track without diff chatter.

If you are a DIYer, this will come in handy:
AMSOIL Hand Pump (Product Code G2039)
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Old Apr 21, 2010 | 09:42 PM
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Originally Posted by Navy Blue 210
Amsoil Severe Gear 75W-90
Originally Posted by Edmond


That's what I use as well. Use it in my Toyota as well and have put significantly more miles on that vehicle.
Originally Posted by Subdriver
I use and recommend this:
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)

Note that this fluid comes with friction modifier already in it and for the C5, adding additional modifier is not normally needed to prevent diff chatter. I use this without modifier in my 02 Z06 on the track without diff chatter.

If you are a DIYer, this will come in handy:
AMSOIL Hand Pump (Product Code G2039)
What they said.
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Old Apr 22, 2010 | 12:00 AM
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Amsoil SVG 75w90 in mine also
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