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My understanding is that GL4 is not so good for gearboxes with yellow metal in them. I am not sure if the Box S does or does not, but I have been running 75W90NS in mine with great success.
I don't think any fluid will make these boxes shift like butter when cold, but I certainly don't think its any worse than stock with the 75W90NS and I'm inclined to think its a better lubricant than the OEM stuff.
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Boxster S
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