Redline will say 75w90NS, thank you call again. They've done so on i-club and nasioc numerous times. Because Shockproof is GL4, they will not recommend it, even "unofficially", for GL5-required uses. So if nobody else had done it, I would not use it in my Subaru. However, lots of people had, so I tried it, and like it. For a daily driver, I will use 75w90NS after first change interval, and for track/autocross cars I will trade the longer life of the R&P and to a lesses extent bearings and gear surfaces for better protection against bad shifts.
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FWD is the new AWD
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