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Thread: 80w90 or 75w140 which is better?

  1. #1

    80w90 or 75w140 which is better?

    which would benefit more in the trans/diff

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  2. #2
    Senior Member
    Join Date
    Aug 2009
    Los Angeles, CA
    I would go with 80 90 the other one is to thick and most dealers out 80 90... I put 80-90w with Lucas oil treatment in my trans and diff to get the oil to stick every where and its was smooth....

  3. #3
    i thought the same but i tried it......mobil one 75w140 has the same fluid thickness as the 80w90.....i just want to know has any one has experimented with it...

    i noticed a quieter rear & smoother shifting...

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