Mobil1 75-90W gear oil

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Thread: Mobil1 75-90W gear oil

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    Veteran Member 2003bajatundra4x4ac's Avatar
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    Default Mobil1 75-90W gear oil

    so i bought 3qts anticipating changing my Front Diff and the Tx case...

    the label says LS (for limited slip). is there anything to be concerned over? i hope the LS, that is an additive, won't be needed - or hurt my components in the Tx and Front Diff.
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    Default Re: Mobil1 75-90W gear oil

    Quote Originally Posted by 2003bajatundra4x4ac View Post
    so i bought 3qts anticipating changing my Front Diff and the Tx case...

    the label says LS (for limited slip). is there anything to be concerned over? i hope the LS, that is an additive, won't be needed - or hurt my components in the Tx and Front Diff.
    well not an expert but i would say the fact that they make different oils for lsd vs open means something and probably shouldnt be interchanged
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    Default Re: Mobil1 75-90W gear oil

    You can use LS oil in an open differential, but if you use non LS oil in a limited slip differential, you will experience chatter while going around corners.
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    Default Re: Mobil1 75-90W gear oil

    Quote Originally Posted by Mr. Creosote View Post
    You can use LS oil in an open differential, but if you use non LS oil in a limited slip differential, you will experience chatter while going around corners.
    good to kno
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    Quote Originally Posted by oofy15354 View Post
    she got mad when i came home and sat in the truck before going inside to see her... i guess the tundra just requires less money and maintenance.....
    Quote Originally Posted by tundrunk View Post
    The sad part is, when I googled "blowmaster" images a picture of my truck comes up, fail.

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    Default Re: Mobil1 75-90W gear oil

    so... for the rest of us.

    LS is UNIVERSAL to any application calling for 75-90W.

    limited slip diff, Tx, front diff.....
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    Default Re: Mobil1 75-90W gear oil

    Just for future reference the synthetic mobil gear oil needs the additive when using it in the toyota lsd in the rear. If you don't add the friction modifier it will chatter even though the label says its compatible with a limited slip diff.
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    Default Re: Mobil1 75-90W gear oil

    thanks guys. i run RP in the lsd and didn't have to add the modifier. no chatter yet. last time i filled with lucas and a tube the chatter returned in 14 months=8k miles.

    i was concerned that the additive might be for the lsd ONLY.
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    Default Re: Mobil1 75-90W gear oil

    I'll 2nd adding the friction modifier for LSD diffy's regardless of what the bottle says.

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    Default Re: Mobil1 75-90W gear oil

    Just did the rear diff service with Mobil 1 75W90 LS Gear Oil today. Piece of cake.
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    Default Re: Mobil1 75-90W gear oil

    That oil is safe for use with open differentials all day, as is, right out the bottle. If you have an LSD, you just need to squirt a tube of friction modifier additive which is safe to use in conjunction with the oil. ONLY if you have LSD you need it, with open diffs you are fine.
    excellent oil by the way.
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    Default Re: Mobil1 75-90W gear oil

    thanks for all the replies. when i said this, "i was concerned that the additive might be for the lsd ONLY." i was refering to the LS (limited slip) on the bottle of gear oil. sounded confusing....

    it's going in the Tx and front diff this week.
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    Default Re: Mobil1 75-90W gear oil

    * * * REAR DIFFERENTIAL REFILL -- FYI * * *
    To properly refill your rear differential, the OEM repair manual specs the fill level to be less than 5mm (0.20 in.) from the lip of the fill hole. What isn't said (but is inferred) is that this applies to vehicles on stock suspensions and at stock height. Those with vehicles with a front end lift may achieve a more accurate fill by jacking up the rear of the vehicle somewhat (1.0"-1.5") when refilling the rear differential to account for this difference. (I understand that a proper pinion angle should negate this, but you never know...)

    When I did mine, this height difference allowed an additional 0.5-0.6 quarts to be added (that's 12-15% by volume, not an insignificant amount!)
    Last edited by Remmy700P; 04-14-2011 at 04:49 PM.
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    Default Re: Mobil1 75-90W gear oil

    M1 installed yesterday.
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