Quote:
Originally Posted by Stephen12ZL1
I tried Royal Purple and I have no doubt it is a great rear end fluid but it does not have the additive packge that GM requires to make the ZL1 rear noise free. In other GM vehicles it is probably a "non-issue". Mobil 1 is similar...great fluid but not the correct additive that GM requires. Try them if you like, but you will come to the same conclusion as I did. Just use the right stuff from GM and forget about it.
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I figured mobile 1 probably made the GM.