Best Diff Oil
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Joined: Aug 2017
Posts: 60
Likes: 4
From: TN
Best Diff Oil
Howdy everyone, I tried to get a consensus on this with much thread searching but couldn't find one. I used to have Royal Purple 75-90 in my diff for 100K (yes I know that's too long ;( but the fluid actually looked great with very little shavings on plug. I just replaced with dealer recommended Penzoil and am getting much clunking when applying power and releasing it - very unimpressed. I'm debating going back to RP or using Motul or Mobil 1. I want whatever is QUIET and SMOOTH. I just street drive the car easy. Please let me know your thoughts thanks. Please be specific on "model" of oil. (2008 6MT with limited slip and 240K on clock). THIS WOULD BE FOR THE REAR DIFF.
Last edited by Texas Boy; Apr 18, 2025 at 02:55 AM. Reason: more specific info needed
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Joined: Aug 2012
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From: San Diego, CA
Howdy everyone, I tried to get a consensus on this with much thread searching but couldn't find one. I used to have Royal Purple 75-90 in my diff for 100K (yes I know that's too long ;( but the fluid actually looked great with very little shavings on plug. I just replaced with dealer recommended Penzoil and am getting much clunking when applying power and releasing it - very unimpressed. I'm debating going back to RP or using Motul or Mobil 1. I want whatever is QUIET and SMOOTH. I just street drive the car easy. Please let me know your thoughts thanks. Please be specific on "model" of oil. (2008 6MT with limited slip and 240K on clock). THIS WOULD BE FOR THE REAR DIFF.
Includes friction modifiers to assist with limited slip operations. No complaints.
Thread Starter
Registered Member
Joined: Aug 2017
Posts: 60
Likes: 4
From: TN
Thanks bro! @socketz67
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