At 58,000 miles I'm ready to change the front and rear gear oil in my 2003 Forester XS (Auto). The book specifies 75W-90 for the rear diff, and 80W-90 in the front. I'd like to go synthetic with Mobil 1, but it's only available in 75W-90.
My question: Would it be OK to use the Mobil 1 75W-90 in the front diff ?? I'm thinking that it's so close it should be OK, but Subaru's recommending a different weight makes me wonder...
I'd appreciate any thoughts/advice on this.
TIA