Looking for thoughts on using 75w140 in a Subaru Outback differential? Schaffers is what I would be using.
75w140 a Subaru differential?
- Thread starter deeter16317
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Why use a heaver gear oil then recomended?
Because I have a lot of it on hand...
No. While Subaru Rally Team uses it, that doesn't mean that we all should
Originally Posted By: Solo2driver
No. While Subaru Rally Team uses it, that doesn't mean that we all should
And other than a slight loss in fuel mileage (potentially), why not?
No. While Subaru Rally Team uses it, that doesn't mean that we all should
And other than a slight loss in fuel mileage (potentially), why not?
Creates more heat in the differential.
Is the heat significant? The differential is aluminum.
I see no good reason to use it and several reasons not to use it. More gear heat in the summer and much more drag in the PA winters + less fuel mileage. I would just get the correct weight & grade and sell the 140 wt.
A synthetic?? I could see this with a conventional, but a synthetic?
Having owned and lived with 2 subies, I'd really stick with a 90 weight, and a syn at that. you can run it, but it's a thick, goopy fluid in a tight-tolerance gearset. will it harm it? probably not. will you feel it? likely? will you see a mpg drop? slight.
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