rpiereck Posted January 2, 2009 Share Posted January 2, 2009 I'm looking to change the oil on the differentials of both my Subies: a 91 Loyale and a 08 Forester. Since this is Alaska and it's freeking cold, I am supposed to use either 80W or 75W/90 according to the owner's manual. Here's my dilemma: I already went to two auto shops, plus Walmart and my super market and they do not have either of those oil weights. I have found 70W/120 and 75W/140, the only two oil weights close to the recommended. Now, if I do get either of those two oils, would the lower operating temperature viscosity (120 or 140) be too thin for a differential? One in question, the 75W/140 is Royal Purple, the same brand I use for my Forester's engine, my oil of choice, and the bottle says that oil is formulated for limited slip diffs. I admit that despite me doing all my maintenance for the past 18 years and being a licensed aircraft mechanic I am a bit of a dunce when it comes to choosing an oil weight other than the recommended by the manufacturer. Link to comment Share on other sites More sharing options...
crash321 Posted January 2, 2009 Share Posted January 2, 2009 I was able to find the correct wieght at Advanced Auto Parts. They even had it in synthetic! Link to comment Share on other sites More sharing options...
idosubaru Posted January 2, 2009 Share Posted January 2, 2009 i would continue shopping around, or order it in the mail if you have to. Link to comment Share on other sites More sharing options...
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