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XPR 10w40 for transmission.oil.

Originally Posted by 370zBLAST Well all the specs meet + exceed with the royal purple. I've used royal purple before on other vehicles with great results! 75w90 =/= 10w40. I

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Old 06-17-2014, 07:30 AM   #11 (permalink)
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Originally Posted by 370zBLAST View Post
Well all the specs meet + exceed with the royal purple. I've used royal purple before on other vehicles with great results!
75w90 =/= 10w40. I wouldn't run gear lube in my engine, either - even if all the other specs were the same.

I have to believe that if such a light-weight oil was good in the transmission, the track guys would be all over it (theoretically, it should provide less resistance). So far, I've seen no mention of anybody doing it to the Z. Matter of fact, in my 40+ years of working with cars, I've never heard of anybody running engine oil in a transmission.

But I'm no expert and I haven't heard everything.

If you do decide to go with the light lube, it might be worthwhile to start doing frequent analysis to check for excessive wear.
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