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Royal Purple gear oil or Mobil 1

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I am going to change my front and rear diffs on my 2000 silverado Z71 and I can't decide to use Mobil 1 or Royal Purple, Any info would be greatly appreciated.







I used Mobil 1, but I think the Royal Purple would be fine also. You might want to do your transfer case also while your doing it, if you have not done it yet. You will need to get Autotrack II fluid, from your dealer to do that job, since there is no equivalent fluid available for that. It's not really expensive, maybe ~6 dollars a quart. You'll need a couple of quarts.:rant:

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