Thread: XPR 10w40 for transmission.oil.
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Old 06-21-2014, 06:23 PM   #13 (permalink)
370zBLAST
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I ended up switching to 75w90 royal purple, and wow, noticed a big improvement with shifts....so crisp and smooth. Also switched to RP hps 5w30 and motor seems smooth....As odd as that sounds.

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