3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

Rear diff oil

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Old Jul 3, 2007 | 12:42 PM
  #16  
TexasCTD's Avatar
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Joined: Nov 2004
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From: McKinney, TX
Originally Posted by 1sttruck
I use the M1, and it looks like olive oil when I change it. I initially used the 75W90, tried the 75W140 for 30k miles, and am back to using the 75W90.


Just curious, what made you go back to the 75w90? Just price or was there another reason for it. I have wondered if I should move up to the 140, but it seems fine with the 90 so far.
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Old Jul 3, 2007 | 03:35 PM
  #17  
Roperteacher's Avatar
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From: Hemet, CA
I switched from the 75/90 to the AMSOIL 75/110. Kind of is a middle man if you tow, just not every day. I tow on the weekend but not all the time.
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