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Questions regarding first diff oil change

Discussion in 'General Discussions' started by stenerson, May 19, 2020.

  1. stenerson

    stenerson Member

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    I notice that these 4th gen trucks have drain plugs for diff fluid which is convenient. On my 3rd gen I had to crack open the case.
    I did like the idea of wiping the metal sludge of the magnet and giving the diff a cleaning, especially during the first break-in period. Am I overthinking this? Does anyone here still crack open the pumpkin to wipe innards clean?
    Also I used m1 fluid in the past and added the LS additive. I noticed recently that some bottles now say LS on the package. Does that mean the additive is already in the oil?
     
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  2. Graygoose

    Graygoose Diplorable Crumb Collector Supporting Member

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    I did on mine, but also changed covers.

    20190307_082236.jpg

    20190309_140512.jpg
     
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  3. McBroom

    McBroom U.S.Marine Veteran Retired 88-2000 Military

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    The additive is premixed nowadays. I believe 1st change is at 32-35000
    Just drain n refill. If the plug don't have the magnet you could order 1 on the web

    Blue Mule
     
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  4. stenerson

    stenerson Member

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    THanks. Looks like I'm overdue.
     
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  5. Travelin Ram

    Travelin Ram Senior Member

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    I am very particular on maintenance, but I’d just drain it (hot) and refill.

    I’d rather do an early oil change at a couple thousand and then again at the specified service intervals rather than grind the wear metals for a year or two before draining it.
     
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  6. MikeG71

    MikeG71 U.S. ARMY '02 - '12 Military

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    I just bought Lucas 75W90 for both my diffs, do I need to add the LS to it or does it already have it?
     

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