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Motul 90 PA Limited Slip Differential Oil 2.1QT (Subaru R180 Rear Diff) (Part Number: )
Motul 90 PA Limited Slip Differential Oil 2.1QT (Subaru R180 Rear Diff) (Part Number: )
Motul 90 PA Limited Slip Differential Oil 2.1QT (Subaru R180 Rear Diff)
Read 14 Reviews | 15 Q&As
Part # 100122
msrp: $27.67

In stock! Ships same day
Universal part

Features & Product Details

RallySport Direct is proud to carry quality lubricants, oils, and fluids from Motul. Motul has established their name, and product in all forms of motorsports, and are trusted by enthusiasts and professional race teams on a worldwide scale. 

Here, you are looking at the Motul 90 PA Limited Slip Differential Oil. This is the fluid you need when performing service to the R180 rear differential. 


  • SAE 90 viscosity
  • Specially formulated for limited slip differentials
  • Sold in a 2.1 US quart container
  • Specifications

    Brand: Motul
    QTY: 2.0L
    Class: GL-4/GL-5
    Mfgr. Warranty: No Warranty
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days

    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



    14 Reviews
    4.8 out of 5 Stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    Customer Photos and Videos
    No user media. You can upload a photo or video of your install by posting a review.
    Worth every penny 11 months ago
    5out of 5stars

    I have a custom rear diff and I have been searching for the right oil. It is loud.. grouchy.. and clunky with the wrong oil. Added this oil.. and poof.. whisper quiet and smooth engagements. So glade i bit the bullet and picked this up.
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    0 of 5 people found the following review helpful
    *sigh* 4 years ago
    2out of 5stars

    I was recommended this oil for my 2004 WRX 5mt rear diff. Turns out it's for LSD clutch style STI differentials. NOT WRX!! So here I am running to find rear diff oil, while I'm halfway through a fluid swap. I informed the representative of the vehicles year, make, model, and transmission. And now I'm stuck with something I can't use, and a dry diff.
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    Awesome!!! 5 years ago
    5out of 5stars

    First off thanks to RSD for always having the dopest products! This stuff simply a must have if you have an 06' STI. Little of a pain to get it in the diff without making a mess but Motul fluids all the way!
    Was this review helpful?
    No problems 5 years ago
    5out of 5stars

    Did a change about 3k ago. Did not have any grinds or weird noises before. Still going well after about 3,000 miles. Easy to do with a cheap hand pump from the parts store.
    Was this review helpful?
    Great Diff Fluid 6 years ago
    5out of 5stars

    Had a bit of diff chatter. Replaced fluid that was in there from previous owner with a quart of Motul 90PA and it's way better. Good stuff, and one of the few approved for the '04 STi rear diff.
    Was this review helpful?


    • Q: Motul 90PA compared to Subaru OEM LSD gear oil.   boostin_dc2 months ago

      Is this safe for my 04 STI? Everyone is saying use the OEM oil.
    • Q: 2005 sti  supraclipse863 months ago

      Is this fluid correct for the rear diff in 2005 Subaru sti?
      • 0 of 0 people found the following answer helpful

        A:  This fluid is meant for the R180, depending on your climate another fluid may be recommended. For the best answer please contact our customer service.

        Michael N. @ RallySport Direct 2 months ago  
        Was this answer helpful?
    • Q: 2007 Subaru Sti stock differential   MarioHdz26268 months ago

      Will this be okay in a 2007 subaru sti stock differential? Winter is around the corner and it gets -20 degrees F sometimes.
    • Q: Gear 300 vs 90PA  Dario j1 year ago

      I have a 2002 wrx wagon and i see that the gear 300 fluid is reccomended for the rear diff but others reccomend using the 90PA for rear diff on a 5speed WRX. What oil should i use for trans and rear diff?
      • 2 of 2 people found the following answer helpful

        A:  We do not recommend 90PA for the WRX as it has open differentials and not mechanical limited slip differentials like the 04-06 STi. For the WRX we recommend Motul Gear300 for the transmission and rear differential. You will need 5qts total to complete the fluid change.

        Jared A. @ RallySport Direct 1 year ago  
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    • Q: LSD Differentials  jaymie982 years ago

      RSD, I have 2007 Subaru Forester XT with a JDM Forester STI 6 speed which has 2 Suretrac LSD,s (front & rear). I purchased the Motul 90pa for both diff & gearbox but the gearbox seems to have a slight wine & vibration over 70mph, any recommedations?
      • 1 of 1 people found the following answer helpful

        A:  It could be that the oil that you put in your transmission has a high viscosity which might give you a slight whine. However it could also be your clutch parts. I would start by diagnosing any clutch issues and if the clutch is all good go with a different trans oil.

        Tyler A. @ RallySport Direct 2 years ago  
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    This Part Fits

    Universal Product
    This item is non application specific.
    Please verify compatibility before purchase. May require some modification for proper installation.