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Differential Fluid-Which do you recommend?

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Old Aug 11, 2020 | 12:50 PM
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Default Differential Fluid-Which do you recommend?

I'd like to get members opinion on the various manufacturers Gear oil. Which did you use?
mobil 1 75W-90
Redline
Royal purple
Amsoil Severe gear
also. if you used a additive in addition to whats in the lube

Thanks in advance for your help!
Bill
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Old Aug 11, 2020 | 12:54 PM
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I used Mobil 1, and didn't use additional friction modifier. I haven't noticed any difference.
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Old Aug 11, 2020 | 02:25 PM
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I've had good luck with Amsoil and have also not had to add any friction modifier.
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Old Aug 11, 2020 | 04:30 PM
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Mobil 1
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Old Aug 11, 2020 | 04:39 PM
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Amsoil with modifier.
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Old Aug 11, 2020 | 05:49 PM
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I used RPM transmissions recommendation:
We recommend Valvoline full synthetic 75/90 (we do not recommend the GM gear oil, Redline, or any shock proof gear oil) • Use 1 tube of GM limited slip additive part # 1052358 unless unit is a Stage IV with a Quaife or Wavetrack LSD. •
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Old Aug 11, 2020 | 08:48 PM
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18 years on Mobil 1 for me, no issues.
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Old Aug 11, 2020 | 09:22 PM
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Amsoil severe gear 75/90 with the tube of slip lock additive
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Redline, with no additive, for the last 18 years......


EDIT: let me clarify that, a little. I have changed the lube a couple of times, in 18 years. I initially changed the diff and tranny lubes, when the car was a year old, and at that time, refilled them with Redline fluids, and have used Redline ever since.

Last edited by leadfoot4; Aug 12, 2020 at 08:06 AM.
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