Gear/transmission oil change question.
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This is a discussion on Gear/transmission oil change question. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; My 04 WRX wagon has been neglected due to my kids getting all the attention. I've owned the car since ...

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    Registered User burgerboy's Avatar
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    Gear/transmission oil change question.

    My 04 WRX wagon has been neglected due to my kids getting all the attention.

    I've owned the car since new and rarely drive it hard. It has ~58K miles, and I'm getting ready to do a bunch of maintenance items. (Plugs, fuel filter, trans/diff oil).

    In doing researching, I've decided on using the Subaru Extra S. My understanding is I won't need more than 4 quarts (or liters) if doing the transmission drain/refill. Is this correct? Best price I've been able to find is a 4 quart package from 42 Autosports. I'm a bit confused on what should go in the rear diff. From what I can gather, the Extra S isn't required, and is probably overkill. If so, what's a good, inexpensive alternative?

    Lastly, since Extra S is synthetic, are there any concerns with putting that stuff in my transmission, which hasn't seen any new fluid for its entire life?

    Any tips for a newbie doing this for the first time will also be greatly appreciated!

    Thanks in advance.
    J
    2004 WRX PSM Wagon
    Mesh hood scoop and grille

    2005 Kawasaki Ti 636

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    Master Baiter EJ257's Avatar
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    Extra-S is a great fluid to use in the gearbox. I believe your transmission requires 3.8L of fluid.

    While you're doing fluids, it would also probably be a good time to do your rear differential fluid, as well. A lot of people use Extra-S in that, too.
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    Registered User shadowpr's Avatar
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    i use extra s in both.

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    zax
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    Yep. WRX 5-spd takes a gallon (3.8L). Extra S is great. I've never been happier with my fluid (Matthew knows).
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    Registered User burgerboy's Avatar
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    Thanks all. Off to search for best pricing on Extra-S!
    J
    2004 WRX PSM Wagon
    Mesh hood scoop and grille

    2005 Kawasaki Ti 636

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    Let us know where you find it, I need to do a full fluid change too.

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    Registered User shadowpr's Avatar
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    There are a few places that sell it for 15 per quart

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    Registered User burgerboy's Avatar
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    Can someone verify whether an 04 uses a Torx70 or a regular socket?

    Seems to have some conflicting info from this thread:
    DIY: Transmission Fluid Change
    J
    2004 WRX PSM Wagon
    Mesh hood scoop and grille

    2005 Kawasaki Ti 636

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    zax
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    Quote Originally Posted by burgerboy View Post
    Can someone verify whether an 04 uses a Torx70 or a regular socket?

    Seems to have some conflicting info from this thread:
    DIY: Transmission Fluid Change
    Just crawl under and look! The transmission drain plug was changed in mid 2004 IIRC
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
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    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by tebriel View Post
    Is that really the bottles it comes in?
    Yes.
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    and wow is it expensive, 15 a quart and then 11 for shipping on each. Too late to call, but does the stealership normally stock it?

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    He simply abides. SD_GR's Avatar
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    Depends on your dealer. Call locally first. They make money on the stuff certainly. I don't use it for cost reasons alone.
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by tebriel
    and wow is it expensive, 15 a quart and then 11 for shipping on each. Too late to call, but does the stealership normally stock it?
    As said, it's dealership dependent whether they will sell it. Mine sells me 4 quarts for $35.
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    What's the non-synthetic recommended for trans and rear diff?

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