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Gear oil - Front and Rear diff

21K views 10 replies 5 participants last post by  zax 
#1 ·
2016 WRX Prem

I was looking into changing my front/rear diff oil since I've now hit 25k miles. I talked to the Subaru dealership and they said that the oil for the front and rear diff is the same....Subaru High Performance 75W-90.

Do others use the same gear oil for both?
 
#3 ·
In the past I have used slightly different oils.. since the transmission is synchromesh I used oil with friction modifiers in the transmission (front diff) and in the rear I used the same oil, only without the friction modifiers. IIRC I was using Redline at the time. Technically oil without friction modifiers should result in less wear since it's "slicker".. in the real world I doubt anyone would be able to tell a difference.
 
#5 ·
I'm not sure if this has changed (I should probably look into it), but the STI used to have different friction modifier requirements compared to the WRX.

Extra S has always been great.
 
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