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I'm having car issues and i'm way pass the due date on my oil change for the diffs. The dealership is charging me about $300 to change it. However, i know i can do it myself. All i need to know is a tutorial and where to find it as well as the amount needed and what recommended oil should i use.
My car is a 2013 subaru wrx (sedan), current mileage is around 75k.
please help me out, thanks !
 

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I believe the front diff oil is changed with the transmission fluid which is a plug on the trans case and then filled from a hole on top of the trans in the engine bay. The rear diff should have two plugs on it. Top plug is the filler and bottom is the drain. Make sure you can get the filler plug open before you open the drain plug or else you're boned lol. I'm running 75w-90 in my car and many others are as well. Good luck with the diff fluid change, I tried to get the plugs off mine recently and they were welded on there practically so be prepared to muscle some plugs haha
 

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2015 ISM WRX Premium SPT package
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Trans plug was a pita, after twisting my beer open it became easier with an impact gun... torqued shut. Rear diff fluid smells like arse lol running Motul 300 gear oil in front and rear. I filled my trans up to fill and drove around then filled again.


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Interesting! The 2015+ seems to differ to my bugeye. Also, there are now three different crush washers specified, with tightening torques from 44 Nm for the Al washer to 70 Nm for the Cu and the black metal washers. Thanks for that.
 
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