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Originally Posted by UNKNOWN_370
As far as lsd oil. I keep mine oil with the stock one. Don't change lsd oil unless you intend to buy an aftermarket lsd. Changing oil "may" void warranty on that part. I would go with redline or nissan oem or castrol. All are good. Right now I'm running castrol and am happy. I ran oem nissan oil on my 09 and it was great too. Really either of them are excellent. Royal purple is best to use while out of warranty. It has properties that nissan oem doesn't approve of while under warranty.
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Changing the oil in your diff. won't void your warranty. In fact is is a good idea because it's full of metal shavings. Check out some of the related threads on this. Also Redline 75W90 GL-5 gear oil is a full syn while the stock diiff. oil is not.