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Good differntial fluid?

legacyak
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

Featured Replies

I'm going to be changing the differential fluids in my OO OBW 5sp tranny. What is the best performing differential oil?

Rear Diff oil - use mobil 1

 

GEAR oil/ Tranny fluid - use redline 75w-90NS or Valvoline Synpower

Valvoline "Synpower" is highest on my list.

 

 

Followed only by Motul "Motylgear".

 

 

 

In the long run, nothing else comes close to offering fast crunch-free shifts.

 

Synpower has recently cured the 2nd and 3rd gear crunch in our newly purchased XT Turbo - 1988 Model Year!

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