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gear oil question

This is a discussion on gear oil question within the Drivetrain forums, part of the LSx Technical Help Section category; I screwed up today. To make a long story short I meant to grab two bottles of 75w-90 at oreilly ...

  1. #1
    Junior Member kevk77's Avatar
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    gear oil question

    I screwed up today. To make a long story short I meant to grab two bottles of 75w-90 at oreilly and I guess I grabbed 1 bottle of 75-140 on accident. So I have half 75-140 and half 75-90. I didn't realize it till I had 2/3 of the bottle poured in. I know I should drain it but at 20.0 a bottle and a messy job I was wondering what yall thought If I just ran it.

  2. #2
    Member jerri311's Avatar
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    I think you will be fine.

  3. #3
    Member jerri311's Avatar
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    Unless you want to spend another $50 doing it right away.

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    Member Lawnboy's Avatar
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    your fine! i ran lucas oil additave and lucas rear end gear oil

  5. #5
    Junior Member kevk77's Avatar
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    thanks

    I just went ahead and changed it again with the right stuff. Im sure it would have been fine but it kept bothering me.

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    Member Lawnboy's Avatar
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    I am the same way , my TA cover was dripping a bit, i could wait to redue it

  7. #7
    None Shall Pass Knight's Avatar
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    Better to spend a little more $ and have peace of mind. I don't think it would've hurt anything but mixing oils can be a tricky thing. Sometimes they do strange things...

  8. #8
    Member Lawnboy's Avatar
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    I use Lucas, if it keeps tractor pullers rears together that have 3,000 hp , it will work fine in my 740 hp street car

  9. #9
    Retired NOT tired SteveC's Avatar
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    2001 Z28 (Sara)

    I use 85-140 dino oil in my rearend, the thicker oil will help disapate the heat better than the 75-90.

    SteveC

  10. #10
    Member c5z28's Avatar
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    I have a buddy in my differential class who used dino based instead of synthetic like the manufacturer said. It was real cool taking apart that rear end and looking at the carnage it did all over the bearings and races.
    Good practice to do it right the first time and not the second time

  11. #11
    Retired NOT tired SteveC's Avatar
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    Thumbs up

    Quote Originally Posted by c5z28 View Post
    I have a buddy in my differential class who used dino based instead of synthetic like the manufacturer said. It was real cool taking apart that rear end and looking at the carnage it did all over the bearings and races.
    Good practice to do it right the first time and not the second time
    I have been running dino oil in my differential for 9 1/2 years, and I have absolutly (sp) no issues whatsoever.

    SteveC

  12. #12
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    i think originally GM used the 85-140........then changed it to 75-90.....no biggy as far as i know

  13. #13
    Member c5z28's Avatar
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    Quote Originally Posted by SteveC View Post
    I have been running dino oil in my differential for 9 1/2 years, and I have absolutly (sp) no issues whatsoever.

    SteveC
    My friend has a f-150 so his tolerances are different then ours( my point was simply my friend did not follow manufacturer spec). I should have taken a pic, oh the carnage!

  14. #14
    Member Blue Thunder 42's Avatar
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    You would have been fine most likely, a little mpg drop and 1hp loss. I wonder if it would run cooler like "SteveC" said?
    Last edited by Blue Thunder 42; 04-06-2010 at 02:49 PM.

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