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Hmmm, never considered doing a diff change as my 08 IS350 just passed 132,000 miles recently. I will have to investigate this.
I did a front and rear diff about at 46k. With the Mobil LS GL 75W-90. No problems since I'm sitting at 78K now. The 9only thing I noticed was a lot of metallic glitter in OEM lube. Probably the break-in particles.
