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I've used $20/qt redline oils, and I'd put the Valvoline right up there with it, for a fraction of the cost. I had no issues with the GL5 rated 85w140 I used in my last project. The higher sulfur content of the diff fluid can harm brass synchos, but I never experienced any issues using the Valvoline in the transmission. It worked amazing in My RS5F70V and RS6 Aisin units without shifting problems at all.
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