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I replaced the gear oil at 60k miles in my Mazda with Royal Purple and I'm satisfied with the purchase. It's slighty smoother especially when cold. The shifter feels like a warm knife cutting through hot butter. I just wish the shifter in the Boxster felt half as positve, smooth and easy to shift. Since it yielded an improvement in the Mazda(even though it shifted well from the start) I might try it in the Porsche if they offer the correct weight.
Last edited by Adam; 10-20-2009 at 07:48 AM.
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