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What fluid to use for drive unit differential?

Discussion in 'Model S' started by sorka, Feb 3, 2017.

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  1. sorka

    sorka Active Member

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    So with the new service requirements of changing the diff fluid once at 12K/1year, I'd like to go ahead and so on my front du diff. My rear was done twice already as they had to replace a leaking seal twice. The front has not been done. It's not a requirement for me from a warranty standpoint but if they're doing it now they must have enough data to show that breakin crud is a real thing from the gears.

    Is the fluid requirement documented anywhere? I think I'll ask service but I suspect they may not tell me. The owners manual does not specify the fluid viscosity.
     
  2. Manzacoty

    Manzacoty Member

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    I assume you mean drive unit?

    Front drive unit part number 1035000-00-F and earlier: Mobil SHC 629

    Front drive unit part number 1035000-00-J and later: DEXRON VI (DEXRON 6) automatic transmission fluid
     
    • Informative x 1
  3. GlmnAlyAirCar

    GlmnAlyAirCar Member

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    There's still a differential in there...
     
  4. Max*

    Max* Charging

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    How easy would this be to DIY?
     
  5. Manzacoty

    Manzacoty Member

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    Looks like all you need to do is remove the underhood storage unit then remove the drain plug and fill it back up. I haven't done it - or have a FDR but seems straight forward.
     
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    • Informative x 1
  6. Piney999

    Piney999 Member

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    Any know what the car would feel like if this fluid was low or gummed up?
     
  7. gavine

    gavine Petrol Head turned EV Enthusiast

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    Here’s a video showing how to do the rear unit on Model S. Hardest part is removing the shielding, unless you don’t have a fluid pump. By the way, they make less-fancy pumps that screw right onto the bottle.

     
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  8. jjh1234

    jjh1234 Member

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    According to my SC, the DU fluid replacement started with newer manufactured vehicles. Not sure when the cutoff date was, but my 11/16 build wasn’t necessary. Just had the first service done last week and they didn’t change fluid.
     
  9. BerTX

    BerTX Active Member

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    You might want to get a second opinion or do more research. The change to do the DU fluid change as part of the first annual service went into effect in February of 2017 IIRC. I had mine done in May, for my 9/2016 MS and they did the fluid change.
     
  10. ⚡️ELECTROMAN⚡️

    ⚡️ELECTROMAN⚡️ Fritterer and waster of hours in an off hand wayer

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    How much did they charge you to do the first year service?
     
  11. jjh1234

    jjh1234 Member

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    It was included in my maintenance plan.
     
  12. jjh1234

    jjh1234 Member

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    I only have 8k miles, so probably can live with fluid change next year.
     
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