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Old 07-13-2009, 03:56 AM   #1
jedrock
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Join Date: Jul 2009
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2003 wrx
silver

Default newbie question regarding gear/differential oil

so I just bought my first WRX.. it's an '03 2.0 turbo 5 speed. I'm in the process of getting all the fluids changed out. I've been doing some reading and am a bit confused about the whole gear/differential oil change. I've read that it takes about 4 quarts for the front and about 1 qt for the rear? is this correct? My users manual doesn't give me an amount or "how to" just how to check the levels. Anyway, I want to do this job myself. I just bought 1 qt of Royal Purple and plan to change my gear oil.. do I have to change both front and rear? is this the same as transmission fluid? Thanks in advance. Sorry if this question has been brought up before. I've searched and really didn't find a specific answer. Thanks again.

i read this... http://www.scoobymods.com/manual_tra...43.html?t=1743
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Old 07-13-2009, 09:50 AM   #2
UkNuck
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Your manual should have the fluid capacities - they're in the 'Specifications' section at the back. The book number is 3.7qt (3.5 liters) but in practice you will probably use 3qt + change in the gearbox/front diff (which are shared on the MT) because not all of the old fluid will drain out - don't just dump 3.5qt in, fill it in stages and check the level. The rear diff takes less than 1qt.

There's no need to remove the intercooler as suggested in your link - get one of those funnels with a flex tube that will fit in the filler.

On the rear diff, DO remember to open the fill plug BEFORE the drain plug - you don't want to drain it then find you can't get the fill plug out.

'Transmission fluid' at least in the US usually means ATF - you need 75W90 GL5 gear oil and unfortunately there are VERY few synthetic gear oils that play nice with the 5-speed synchros. I have used 'cocktails' in the past but if I was doing it today I'd probably go with the Motul Gear 300. If you go with the regular Maxgear RP you might want to consider adding 1qt of the Synchromax. For the rear diff any 75W90 GL5 will do. Hope this helps.
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Old 07-13-2009, 11:05 AM   #3
jedrock
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Thanks for clearing this up for me. But one more thing. So the Transmission fluid is not the same as the gear oil, correct? Meaning different drain and fill plugs?
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Old 07-13-2009, 11:42 AM   #4
UkNuck
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Gearbox including front differential (in the case of the Subaru manual transmissions) is filled through one hole, rear differential is filled separately. Those are the only 'transmission fluids' on the MT - the AT has a separate filler for front differential gear oil because its 'transmission fluid' (ATF) is a hydraulic fluid rather than a gear oil.
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Old 07-13-2009, 11:59 AM   #5
jedrock
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ah i see said the blind man. thanks for the quick response and helpful information. i'll be changing the fluids today. i'll let you know how it goes
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Old 07-13-2009, 05:19 PM   #6
jedrock
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the front gear/differential oil change went well! thanks again for the help!
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