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Wrong gear oil, now what?

('06-'08) 
1K views 6 replies 7 participants last post by  Lone Ranger 
#1 ·
Somehow I bought, made it home with, and installed Mobil 1 75w-140 gear oil instead of the 75w-90 as I thought I bought. :crazy: This went into the rear diff on my 06' forester. I guess I needed more coffee this morning. It wasn't until I was putting the old fluid into the can did I realize my mistake. So the question is, does it really matter??? I guess it could affect fuel economy, but will it damage my rear diff?? What do you guys think? Thanks!
 
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