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Synthetic Rear Lube question

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Old Oct 3, 2005 | 10:56 AM
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Default Synthetic Rear Lube question

If I change to RedLine red syn rear lube do I still need to put the GM additive in also?

Last edited by craig04c5; Oct 4, 2005 at 09:09 AM.
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Old Oct 3, 2005 | 11:37 AM
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Originally Posted by craig04c5
If I change to RedLine ted syn rear lube do I still need to put the GM additive in also?
When I emailed redline about this they said no as redline already has some additive it in.

Amsoil said it won't hurt to add it. I never have with the amsoil and never had a problem. Some say that they need to with amsoil.

If you use Mobil 1, you should use the additive.
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Old Oct 3, 2005 | 11:59 AM
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There are two Redlines, 75W-90 and 75W-90NS. The first has the additive in it, the second does not. This allows you to tailor the additive to the clutch pack if necessary. I have been told not to put GM additive in Redline as the base is different. Adding too much is detrimental because it will reduce (or even eliminate) the limited slip capability.

Amsoil also has the additive in it, and I am running that right now without any problems at all.

Don't know about Mobil-1.

The amount of additive is based on a stock clutch pack, but vendors like DTE have different requirements due to their clutch pack characteristics.
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Old Oct 3, 2005 | 12:32 PM
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I am getting to change out my rear diff fluid, and I did some research on it. It seems as if the general consensus was the 75/90 red line sythetic and I read a post from DTE that said USE the 4 oz of the additive, even though the red line has it in it.
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Old Oct 3, 2005 | 12:39 PM
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Been using Redline with FM for years now.
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Old Oct 3, 2005 | 01:25 PM
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Originally Posted by nprsuit
I am getting to change out my rear diff fluid, and I did some research on it. It seems as if the general consensus was the 75/90 red line sythetic and I read a post from DTE that said USE the 4 oz of the additive, even though the red line has it in it.
This is what I did as well!
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Old Oct 3, 2005 | 01:52 PM
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As we've stated in our previous posts here and there~ We require additional LSA in *OUR* HP differentials only, due to the very heavy duty nature of our clutch pack assembly we engineer into the unit.

Best Wishes,
DTE
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Old Oct 3, 2005 | 03:15 PM
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Originally Posted by MHVette
This is what I did as well!
ONLY suggested if you're using the DTE clutchpak, with a stock rear end it could actually be detrimental to use additional additive.........
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Old Oct 4, 2005 | 09:13 AM
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Thanks to all for the answers. Looks like stock rear does not need the additive with the RedLine syn as stated by DTE.
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Old Oct 4, 2005 | 09:07 PM
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Originally Posted by craig04c5
Thanks to all for the answers. Looks like stock rear does not need the additive with the RedLine syn as stated by DTE.
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